0001628280-26-032347 | 10-Q | XBRL Viewer

WARRANTY LIABILITY (Tables)

6 Months Ended

Mar. 31, 2026

Product Warranties Disclosures [Abstract]

Schedule of Changes in Warranty Liability

Changes in Griffon’s warranty liability, included in Accrued liabilities, for the three and six months ended March 31, 2026 and 2025 were as follows:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025
Balance, beginning of period	$	6,150	$	5,519	$	5,694	$	5,524
Warranties issued and changes in estimated pre-existing warranties	4,255		3,352		6,892		6,476
Actual warranty costs incurred	(3,863)		(2,855)		(6,044)		(5,984)

Balance, end of period	$	6,542	$	6,016	$	6,542	$	6,016

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
CURRENT ASSETS
Cash and equivalents	$ 109,672	$ 99,045
Accounts receivable, net of allowances of $5,999 and $5,641	200,906	196,957
Inventories	184,163	171,747
Prepaid and other current assets	39,308	42,079
Assets of discontinued operations held for sale	695,755	735,816
Total Current Assets	1,229,804	1,245,644
PROPERTY, PLANT AND EQUIPMENT, net	202,637	195,950
OPERATING LEASE RIGHT-OF-USE ASSETS	68,355	53,041
GOODWILL	191,253	191,253
INTANGIBLE ASSETS, net	349,975	363,955
OTHER ASSETS	24,249	26,191
Total Assets	2,066,273	2,076,034
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	8,018	8,033
Accounts payable	84,805	57,663
Accrued liabilities	92,643	114,628
Current portion of operating lease liabilities	17,232	15,473
Liabilities of discontinued operations	226,923	250,390
Total Current Liabilities	429,621	446,187
LONG-TERM DEBT, net	1,394,836	1,404,276
LONG-TERM OPERATING LEASE LIABILITIES	55,201	40,453
OTHER LIABILITIES	92,168	111,146
Total Liabilities	1,971,826	2,002,062
COMMITMENTS AND CONTINGENCIES - See Note 20
SHAREHOLDERS’ EQUITY
Total Shareholders’ Equity	94,447	73,972
Total Liabilities and Shareholders’ Equity	$ 2,066,273	$ 2,076,034

LEASES - Schedule of Average Lease Terms and Discount Rates (Details)	Mar. 31, 2026
Weighted-average remaining lease term (years):
Operating Leases	5 years 6 months
Finance Leases	8 months 1 day
Weighted-average discount rate:
Operating Leases	6.05%
Finance Leases	7.29%

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 492,281	$ 473,785
Accumulated depreciation	(289,644)	(277,835)
Total	202,637	195,950
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	101,877	100,415
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	360,058	343,029
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	30,346	30,341
Construction in Progress
Property, Plant and Equipment [Line Items]
Machinery and equipment	$ 22,163	$ 31,078

REPORTABLE SEGMENTS - Schedule of Information on Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenue	$ 421,860	$ 426,684	$ 876,120	$ 870,137

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 9: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

EARNINGS PER SHARE (EPS) (Tables)

6 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Reconciliation of Share Amounts Used in Computing Earnings Per Share

The following table is a reconciliation of the share amounts (in thousands) used in computing earnings per share:


	Three Months Ended March 31,		Six Months Ended March 31,
	2026	2025	2026	2025
Common shares outstanding	46,115	47,231	46,115	47,231

Non-vested restricted stock	(1,801)	(1,611)	(1,801)	(1,611)
Impact of weighted average shares	302	38	322	(22)
Weighted average shares outstanding - basic	44,616	45,658	44,636	45,598
Incremental shares from stock-based compensation	1,074	1,242	1,091	1,628
Weighted average shares outstanding - diluted	45,690	46,900	45,727	47,226

PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

The following table details the components of property, plant and equipment, net:


	At March 31, 2026		At September 30, 2025
Land, building and building improvements	$	101,877	$	100,415
Machinery and equipment(1)	360,058		343,029
Leasehold improvements	30,346		30,341
	492,281		473,785
Accumulated depreciation	(289,644)		(277,835)
Total	$	202,637	$	195,950

(1) Machinery and equipment includes approximately $22,163 and $31,078 of construction in progress assets as of March 31, 2026 and September 30, 2025, respectively.

WARRANTY LIABILITY

6 Months Ended

Mar. 31, 2026

Product Warranties Disclosures [Abstract]

WARRANTY LIABILITY

The Company offers warranties against product defects for periods generally ranging from one to ten years, with limited lifetime warranties on certain door and fan models. Typical warranties require the Company to repair or replace the defective products during the warranty period at no cost to the customer. At the time revenue is recognized, Griffon records a liability for warranty costs, estimated based on historical experience, and periodically assesses its warranty obligations and adjusts the liability as necessary. Warranty costs expected to be incurred in the next 12 months are classified in accrued liabilities. Warranty costs expected to be incurred beyond one year are classified in other long-term liabilities. The short-term warranty liability was $6,542 as of March 31, 2026 and $5,694 as of September 30, 2025. The long-term warranty liability was $1,239 at both March 31, 2026 and September 30, 2025.

Changes in Griffon’s warranty liability, included in Accrued liabilities, for the three and six months ended March 31, 2026 and 2025 were as follows:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025
Balance, beginning of period	$	6,150	$	5,519	$	5,694	$	5,524
Warranties issued and changes in estimated pre-existing warranties	4,255		3,352		6,892		6,476
Actual warranty costs incurred	(3,863)		(2,855)		(6,044)		(5,984)

Balance, end of period	$	6,542	$	6,016	$	6,542	$	6,016

OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ 2,356		$ 2,092		$ 7,001	$ (14,623)
Tax	(182)		325		(275)	(659)
Net of tax	2,174	$ 4,552	2,417	$ (17,699)	6,726	(15,282)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1,020		2,970		4,621	(17,048)
Tax	0		0		0	0
Net of tax	1,020		2,970		4,621	(17,048)
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	2,440		685		4,880	754
Tax	(513)		(144)		(1,025)	(158)
Net of tax	1,927		541		3,855	596
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(1,104)		(1,563)		(2,500)	1,671
Tax	331		469		750	(501)
Net of tax	$ (773)		$ (1,094)		$ (1,750)	$ 1,170

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-17

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

+ Details

- Definition

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-17

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-5

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482739/220-10-55-15

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

+ Details

- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-17

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-11

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-2

+ Details

INVENTORIES

6 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

INVENTORIES

Inventories are stated at the lower of cost (first-in, first-out or average cost) or net realizable value.

The following table details the components of inventory:


	At March 31, 2026		At September 30, 2025
Raw materials and supplies	$	77,867	$	71,742
Work in process	9,439		9,193
Finished goods	96,857		90,812
Total	$	184,163	$	171,747

OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

6 Months Ended

Mar. 31, 2026

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The amounts recognized in other comprehensive income (loss) were as follows:


	For the Three Months Ended March 31,
	2026						2025

	Pre-tax		Tax		Net of tax		Pre-tax		Tax		Net of tax
Foreign currency translation adjustments	$	1,020	$	—	$	1,020	$	2,970	$	—	$	2,970
Pension and other defined benefit plans	2,440		(513)		1,927		685		(144)		541
Cash flow hedges	(1,104)		331		(773)		(1,563)		469		(1,094)

Total other comprehensive income (loss)	$	2,356	$	(182)	$	2,174	$	2,092	$	325	$	2,417

Schedule of Components of Accumulated Other Comprehensive Income (Loss)

The components of Accumulated other comprehensive income (loss) are as follows:


	At March 31, 2026		At September 30, 2025
Foreign currency translation adjustments	$	(40,534)	$	(45,155)
Pension and other defined benefit plans	(23,633)		(27,488)
Cash flow hedges	(1,027)		723
Total	$	(65,194)	$	(71,920)

Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

Amounts reclassified from accumulated other comprehensive income (loss) to income were as follows:


	For the Three Months Ended March 31,				For the Six Months Ended March 31,
Gain (Loss)	2026		2025		2026		2025


Pension amortization	$	(1,970)	$	(285)	$	(3,940)	$	(570)
Cash flow hedges	260		(388)		322		(608)

Total gain (loss) before tax	$	(1,710)	$	(673)	$	(3,618)	$	(1,178)
Tax benefit	359		141		760		247
Net of tax	$	(1,351)	$	(532)	$	(2,858)	$	(931)

CREDIT LOSSES - Schedule of Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance, October 1	$ 5,641	$ 6,223
Provision for expected credit losses	216	(309)
Amounts written off charged against the allowance	(160)	(143)
Other	302	587
Ending Balance, March 31	$ 5,999	$ 6,358

REPORTABLE SEGMENTS - Schedule of Disaggregated Revenue by End Market and Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	$ 421,860	$ 426,684	$ 876,120	$ 870,137
Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	421,860	426,684	876,120	870,137
Residential repair and remodel \| Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	220,766	226,716	464,767	465,561
Commercial \| Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	170,626	168,387	348,406	339,143
Residential new construction \| Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	$ 30,468	$ 31,581	$ 62,947	$ 65,433

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

REPORTABLE SEGMENTS

6 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

REPORTABLE SEGMENTS

REPORTABLE SEGMENT

Subsequent to the actions discussed in Note 1, Griffon now conducts its operations through one reportable segment, managed on a consolidated basis. All prior period comparative information has been conformed to this reporting structure.

Griffon Corporation is a leading provider of residential and commercial building products. The Company is the largest manufacturer and marketer of garage doors and rolling steel doors in North America. Sectional garage doors for residential and commercial applications are sold under the brands Clopay, IDEAL, and Holmes. Rolling steel door and grille products designed for commercial, industrial, institutional, and retail use are sold under the Clopay, Cornell, and Cookson brands. The Company is also a leading provider of residential, industrial, and commercial ceiling fans sold under the Hunter, Casablanca, and Jan Fan brands.

Griffon is organized based on the nature of products sold by the Company, its production and distribution mode, its internal management structure and information that is regularly provided to the Chief Operating Decision Maker ("CODM"), which is our Chief Executive Officer. The CODM reviews financial information presented on a consolidated basis when managing the operations of the Company for purposes of allocating resources and assessing performance, and measures performance using net income (loss). There are no other significant expense categories reviewed by the CODM, other than what is presented in the Consolidated Statement of Operations and depreciation and amortization expense, which is presented in the Consolidated Statement of Cash Flows.

Disaggregation of Revenue

Revenue from contracts with customers is disaggregated by end markets as it more accurately depicts the nature and amount of the Company’s revenue. The following table presents revenue disaggregated by end market:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025
Residential repair and remodel(1)	$	220,766	$	226,716	$	464,767	$	465,561
Commercial	170,626		168,387		348,406		339,143
Residential new construction(1)	30,468		31,581		62,947		65,433
Total	$	421,860	$	426,684	$	876,120	$	870,137

_____________________

(1) The breakout between residential new construction and residential repair and remodel contains certain management assumptions, such as customer and product type.

The Company’s consolidated revenue is concentrated in the United States. Revenue generated from sales to customers in the United States was approximately 96% of consolidated revenue for both the three and six months ended March 31, 2026. For the three and six months ended March 31, 2025, revenue generated from sales to customers in the United States was approximately 96% and 95% of consolidated revenue, respectively. As of March 31, 2026 and September 30, 2025, the Company's long-lived assets are primarily concentrated in the United States.

As the Company discloses one reportable segment, net income is reported in the Condensed Consolidated Statements of Operations, assets are reported in the Condensed Consolidated Balance Sheets, and capital expenditures are reported in the Condensed Consolidated Statements of Cash Flows.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 11: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 12: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 13: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 14: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 15: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 16: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-34

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26C

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26B

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/280/tableOfContent

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

+ Details

LONG-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Outstanding Balance	$ 1,411,793	$ 1,423,811
less: Current portion	(8,018)	(8,033)
Long-term debt	1,403,775	1,415,778
Original Issuer Premium/(Discount)	(244)	(340)
Capitalized Fees & Expenses	(8,695)	(11,162)
Balance Sheet	1,402,854	1,412,309
less: Current portion	(8,018)	(8,033)
Long-term debt	1,394,836	1,404,276
Senior notes due 2028
Debt Instrument [Line Items]
Outstanding Balance	974,775	974,775
Original Issuer Premium/(Discount)	97	121
Capitalized Fees & Expenses	(3,871)	(4,880)
Balance Sheet	$ 971,001	$ 970,016
Coupon Interest Rate	5.75%	5.75%
Term loan B due 2029
Debt Instrument [Line Items]
Outstanding Balance	$ 387,000	$ 449,000
Original Issuer Premium/(Discount)	(341)	(461)
Capitalized Fees & Expenses	(3,084)	(4,169)
Balance Sheet	383,575	444,370
Revolver due 2028
Debt Instrument [Line Items]
Outstanding Balance	50,000	0
Original Issuer Premium/(Discount)	0	0
Capitalized Fees & Expenses	(1,740)	(2,113)
Balance Sheet	48,260	(2,113)
Other debt
Debt Instrument [Line Items]
Outstanding Balance	18	36
Original Issuer Premium/(Discount)	0	0
Capitalized Fees & Expenses	0	0
Balance Sheet	$ 18	$ 36

OTHER COMPREHENSIVE INCOME (LOSS)

6 Months Ended

Mar. 31, 2026

Other Comprehensive Income (Loss), Net of Tax [Abstract]

OTHER COMPREHENSIVE INCOME (LOSS)

The amounts recognized in other comprehensive income (loss) were as follows:


	For the Three Months Ended March 31,
	2026						2025

	Pre-tax		Tax		Net of tax		Pre-tax		Tax		Net of tax
Foreign currency translation adjustments	$	1,020	$	—	$	1,020	$	2,970	$	—	$	2,970
Pension and other defined benefit plans	2,440		(513)		1,927		685		(144)		541
Cash flow hedges	(1,104)		331		(773)		(1,563)		469		(1,094)

Total other comprehensive income (loss)	$	2,356	$	(182)	$	2,174	$	2,092	$	325	$	2,417


	For the Six Months Ended March 31,
	2026						2025
	Pre-tax		Tax		Net of tax		Pre-tax		Tax		Net of tax
Foreign currency translation adjustments	$	4,621	$	—	$	4,621	$	(17,048)	$	—	$	(17,048)
Pension and other defined benefit plans	4,880		(1,025)		3,855		754		(158)		596
Cash flow hedges	(2,500)		750		(1,750)		1,671		(501)		1,170

Total other comprehensive income (loss)	$	7,001	$	(275)	$	6,726	$	(14,623)	$	(659)	$	(15,282)

The components of Accumulated other comprehensive income (loss) are as follows:


	At March 31, 2026		At September 30, 2025
Foreign currency translation adjustments	$	(40,534)	$	(45,155)
Pension and other defined benefit plans	(23,633)		(27,488)
Cash flow hedges	(1,027)		723
Total	$	(65,194)	$	(71,920)

Amounts reclassified from accumulated other comprehensive income (loss) to income were as follows:


	For the Three Months Ended March 31,				For the Six Months Ended March 31,
Gain (Loss)	2026		2025		2026		2025


Pension amortization	$	(1,970)	$	(285)	$	(3,940)	$	(570)
Cash flow hedges	260		(388)		322		(608)

Total gain (loss) before tax	$	(1,710)	$	(673)	$	(3,618)	$	(1,178)
Tax benefit	359		141		760		247
Net of tax	$	(1,351)	$	(532)	$	(2,858)	$	(931)

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2026 USD ($)	Jun. 30, 2026 USD ($)	Mar. 31, 2026 segment	Sep. 30, 2026
Schedule of Equity Method Investments [Line Items]
Impairment charges	$ 22,648
Number of reportable segments \| segment			1
Subsequent Event \| Forecast
Schedule of Equity Method Investments [Line Items]
Proceeds from organization of joint venture		$ 100,000
Notes issued		$ 161,100
ONCAP \| Subsequent Event \| Forecast
Schedule of Equity Method Investments [Line Items]
Equity interest (as percent)				57.00%
Griffon \| Subsequent Event \| Forecast
Schedule of Equity Method Investments [Line Items]
Equity interest (as percent)				43.00%

OTHER INCOME (EXPENSE)	6 Months Ended
OTHER INCOME (EXPENSE)	Mar. 31, 2026
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended March 31, 2026 and 2025, Other income (expense) of $(1,238) and $317, respectively, includes $134 and ($6), respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $(1,908) and $(40), respectively, net gains (losses) on investments of $122 and $(16), respectively, and royalty income of $445 and $556, respectively. Net periodic benefit plan expense includes a charge of $1,609 recorded in the three months ended March 31, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 13 - Employee Benefit Plans for additional details. For the six months ended March 31, 2026 and 2025, Other income (expense) of $(2,616) and $586, respectively, includes $283 and $(276), respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $(3,815) and $(81), respectively, net gains (losses) on investments of $(7) and $54, respectively, and royalty income of $964 and $1,146, respectively. Net periodic benefit plan expense includes a charge of $3,218 recorded in the six months ended March 31, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 13 - Employee Benefit Plans for additional details.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenue	$ 421,860	$ 426,684	$ 876,120	$ 870,137
Cost of goods and services	229,871	228,337	475,398	460,403
Gross profit	191,989	198,347	400,722	409,734
Selling, general and administrative expenses	104,643	107,461	213,963	214,507
Income from continuing operations	87,346	90,886	186,759	195,227
Other income (expense)
Interest expense	(21,137)	(23,857)	(43,130)	(48,695)
Interest income	4	241	241	339
Loss from debt extinguishment	0	0	(556)	0
Other, net	(1,238)	317	(2,616)	586
Total other expense, net	(22,371)	(23,299)	(46,061)	(47,770)
Income before taxes from continuing operations	64,975	67,587	140,698	147,457
Provision for income taxes from continuing operations	18,038	17,782	38,189	38,516
Income from continuing operations	46,937	49,805	102,509	108,941
Net income	$ 19,318	$ 56,762	$ 83,705	$ 127,613
Income from continuing operations (in dollars per share)	$ 1.05	$ 1.09	$ 2.30	$ 2.39
Income from discontinued operations (in dollars per share)	(0.62)	0.15	(0.42)	0.41
Basic earnings per common share (in dollars per share)	$ 0.43	$ 1.24	$ 1.88	$ 2.80
Basic weighted-average shares outstanding (in shares)	44,616	45,658	44,636	45,598
Diluted earnings per common share (in dollars per share)	$ 0.42	$ 1.21	$ 1.83	$ 2.70
Diluted weighted-average shares outstanding (in shares)	45,690	46,900	45,727	47,226
Dividends paid per common share (in dollars per share)	$ 0.22	$ 0.18	$ 0.44	$ 0.36
Income from continuing operations (in dollars per share)	1.03	1.06	2.24	2.31
Income from discontinued operations (in dollars per share)	$ (0.60)	$ 0.15	$ (0.41)	$ 0.40
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ 1,020	$ 2,970	$ 4,621	$ (17,048)
Pension and other post retirement plans	1,927	541	3,855	596
Change in cash flow hedges	(773)	(1,094)	(1,750)	1,170
Total other comprehensive income (loss), net of taxes	2,174	2,417	6,726	(15,282)
Comprehensive income, net	$ 21,492	$ 59,179	$ 90,431	$ 112,331

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION About Griffon Corporation Griffon Corporation (the “Company,” “Griffon,” “we” or “us”) is a leading provider of residential and commercial building products. The Company is the largest North American manufacturer and marketer of garage doors under the Clopay, IDEAL and Holmes brands, and rolling steel door and grille products under the Clopay, Cornell, and Cookson brands. The Company is also a leading provider of residential, industrial, and commercial ceiling fans sold under the Hunter, Casablanca, and Jan Fan brands. The Company, founded in 1959, is organized as a Delaware corporation headquartered in New York, N.Y. and listed on the New York Stock Exchange (NYSE:GFF). On February 5, 2026, Griffon announced it entered into a definitive agreement to form a joint venture with ONCAP, the mid-market private equity platform of Onex Corporation (TSX:ONEX), to create a leading global provider of hand tools, home organization solutions, and lawn and garden products for professionals and consumers. The joint venture will combine the United States and Canada businesses of Griffon’s AMES Companies (“AMES”) with the Bellota Tools, Corona, and Burgon & Ball businesses of Venanpri, an ONCAP majority-owned portfolio company. The joint venture will be managed as a subsidiary of Venanpri which, together with other affiliates of ONCAP, will hold a 57% equity interest. Upon closing of the transaction, Griffon will receive consideration of $100,000 in cash, subject to working capital adjustments, will enter into a credit agreement with the joint venture to evidence a $161,100 second-lien loan provided to the joint venture, and will participate in the governance and oversight of the joint venture as a 43% equity holder. Griffon will accrue interest receivable on the second-lien loan through the date of maturity. The joint venture will be financed through committed debt financing, in addition to the second-lien loan provided by Griffon. This transaction is subject to customary closing conditions and, after closing, which is expected to occur by the end of June 2026, Griffon’s interest in the joint venture will be accounted for as an equity method investment. As of March 31, 2026, the Company recorded a loss of $22,648 on assets held for sale because the carrying value of the United States (“U.S.”) and Canada businesses of the AMES Companies is greater than its estimated fair value less its cost to sell. Griffon also announced on February 5, 2026 the initiation of a comprehensive review of strategic alternatives for its AMES Australia and United Kingdom ("U.K.") operations. The strategic process for AMES Australia is active and ongoing and we expect to complete the process by the end of the calendar year. As of March 31, 2026, the Company ceased its AMES U.K. operations and will liquidate its assets and settle its liabilities. As a result of these actions, AMES’ U.S., Canada, Australia, and U.K. operations have been reported as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented. Except for certain U.K. assets and liabilities not held for sale, we classified the assets and liabilities associated with the AMES' U.S., Canada, Australia and U.K. discontinued operations as held for sale in the Condensed Consolidated Balance Sheets. The U.K. assets classified as held for sale relate to inventory and property, plant and equipment that will be sold in liquidation. Accordingly, all references made to results and information in this Quarterly Report on Form 10-Q are to Griffon's continuing operations, unless specifically noted otherwise. Refer to Note 15, Discontinued Operations for further details. Griffon now conducts its operations through one reportable segment, managed on a consolidated basis. All prior period comparative segment information presented has been applied retrospectively to reflect the new segment structure. For further information regarding our segment reporting, see Note 12, Reportable Segment. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information, and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all the information and footnotes required by US GAAP for complete financial statements. As such, they should be read together with Griffon’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, which provides a more complete explanation of Griffon’s accounting policies, financial position, operating results, business, properties and other matters. In the opinion of management, these financial statements reflect all adjustments considered necessary for a fair statement of interim results. Griffon’s businesses are seasonal; for this and other reasons, the financial results of the Company for any interim period are not necessarily indicative of the results for the full year. The Condensed Consolidated Balance Sheet information at September 30, 2025 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2025. The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain amounts in prior years may have been reclassified to conform to the current year presentation. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. These estimates may be adjusted due to changes in economic, industry or customer financial conditions, as well as changes in technology or demand. Significant estimates include expected loss allowances for credit losses and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, assumptions associated with pension benefit obligations and income or expenses, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, assumptions associated with stock based compensation valuation, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations and the accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions Griffon may undertake in the future. Actual results may ultimately differ from these estimates.

RECENT ACCOUNTING PRONOUNCEMENTS	6 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Mar. 31, 2026
Accounting Changes and Error Corrections [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS Issued but not yet effective accounting pronouncements In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The new standard was issued to improve transparency and decision usefulness of income tax disclosures by providing information that helps investors better understand how an entity's operations, tax risks, tax planning and operational opportunities affect its tax rate and future cash flows. The standard requires significant additional disclosures focused on income taxes paid and the rate reconciliation table. Specifically, the amendments in the standard require the Company to disclose disaggregated: (1) income taxes paid by federal, state, and foreign, (2) continuing operations pre-tax income between domestic and foreign, and (3) continuing operations income tax expense by federal, state and foreign. The standard also requires the Company to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This standard is effective for the Company beginning with our fiscal year 2026 annual reporting period, and can be applied prospectively or retrospectively. While the Company is currently evaluating the guidance to determine the impact it may have on its condensed consolidated financial statements, the Company does not expect the adoption of this standard to have a material impact on its financial position, results of operations, or cash flows. In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update require disclosures and further disaggregation, in the notes to financial statements, of specified information regarding certain costs and expenses. The required disclosures include the amounts of purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depreciation, depletion, and amortization recognized as part of oil and gas producing activities included in each relevant expense caption. Additionally, further disclosures are required for certain amounts already required to be disclosed under current GAAP, a qualitative description of amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and the total amount of selling expenses, and on an annual basis, the definition of selling expenses. The ASU is effective for the Company beginning with the Company's fiscal year 2028 and interim reporting periods beginning with the Company's 2029 fiscal year. Implementation of this standard may be applied prospectively or retrospectively. The Company is currently evaluating this guidance to determine the impact it may have on its condensed consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 105
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 9
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479343/105-10-65-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 17
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480336/718-10-65-17

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 17
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480336/718-10-65-17

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476173/280-10-65-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 105
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479343/105-10-65-7

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-5

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 6
-Subparagraph (i)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480528/815-20-65-6

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-6

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 250
-Publisher FASB
-URI https://asc.fasb.org/250/tableOfContent

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

+ Details

DISCONTINUED OPERATIONS - Balance Sheets Information of Discontinued Operations (Details) - Defense Electronics - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Sep. 30, 2025
CURRENT ASSETS
Cash and equivalents	$ 0	$ 0
Accounts receivable, net	102,956	93,850
Inventories	247,588	269,025
Prepaid and other current assets	13,918	12,282
PROPERTY, PLANT AND EQUIPMENT, net	94,710	103,187
OPERATING LEASE RIGHT-OF-USE ASSETS	112,903	114,788
GOODWILL	1,664	1,664
INTANGIBLE ASSETS, net	122,758	124,159
ASSETS OF DISCONTINUED OPERATIONS	21,906	16,861
VALUATION ALLOWANCE	(22,648)	0
Total assets of discontinued operations	695,755	735,816
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	84	70
Accounts payable	65,267	79,822
Accrued liabilities	37,702	42,034
Current portion of operating lease liabilities	17,575	16,834
LONG-TERM DEBT, net	236	110
LONG-TERM OPERATING LEASE LIABILITIES	101,303	106,750
OTHER LIABILITIES	4,756	4,770
Total liabilities of discontinued operations	226,923	$ 250,390
Loss on discontinued operation	22,648
Inventory write down	14,332
Estimated selling costs	$ 8,316

EMPLOYEE BENEFIT PLANS - Schedule of Defined Benefit Pension Income Included in Other Income (Expense ) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Service cost	$ 94	$ 0	$ 188	$ 0
Interest cost	525	645	1,050	1,291
Expected return on plan assets	(587)	(890)	(1,175)	(1,780)
Amortization:
Recognized actuarial loss	361	285	722	570
Prior service cost	1,609	0	3,218	0
Net periodic benefit plan expense	$ 2,002	$ 40	$ 4,003	$ 81

GOODWILL AND OTHER INTANGIBLES - Schedule of Gross Carrying Value and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 279,329	$ 292,691
Trademarks	136,593	136,593
Total intangible assets	415,922	429,284
Accumulated Amortization	65,947	65,329
Customer relationships & other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	272,692	284,984
Accumulated Amortization	$ 61,886	61,291
Average Life (Years)	15 years
Technology, patents & other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,637	7,707
Accumulated Amortization	$ 4,061	$ 4,038
Average Life (Years)	3 years

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-20

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-20

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-38

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 12: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 13: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 14: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 15: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 16: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 18: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 19: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 29
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-29

Reference 20: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 29
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-29

Reference 21: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-20

Reference 22: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-20

Reference 23: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 24: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 25: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 26: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 27: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 28: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482686/350-30-45-1

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-3

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483154/926-20-50-5

+ Details

LEASES - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 9,183	$ 8,678
Financing cash flows from finance leases	13	12
Total	9,196	8,690
Right of use assets obtained in exchange for new lease obligations:
Operating leases	24,467	11,301
Finance leases	0	0
Total	$ 24,467	$ 11,301

WARRANTY LIABILITY - Schedule of Changes in Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of period	$ 6,150	$ 5,519	$ 5,694	$ 5,524
Warranties issued and changes in estimated pre-existing warranties	4,255	3,352	6,892	6,476
Actual warranty costs incurred	(3,863)	(2,855)	(6,044)	(5,984)
Balance, end of period	$ 6,542	$ 6,016	$ 6,542	$ 6,016

LONG-TERM DEBT - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	50 Months Ended
LONG-TERM DEBT - Narrative (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2020	Mar. 31, 2026	Sep. 30, 2025	Sep. 30, 2024	Jan. 24, 2024	Jan. 23, 2024	Aug. 01, 2023	Jul. 31, 2023	Sep. 30, 2022	Jan. 24, 2022
Debt Instrument [Line Items]
Capitalized fees and expenses	$ 8,695,000		$ 8,695,000			$ 8,695,000	$ 11,162,000
Long-term debt, gross	1,411,793,000		1,411,793,000			1,411,793,000	1,423,811,000
Loss from debt extinguishment	0	$ 0	556,000	$ 0
Revolver due 2028
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 500,000,000	$ 400,000,000
Outstanding balance	50,000,000		50,000,000			50,000,000
Outstanding standby letters of credit	13,152,000		13,152,000			13,152,000
Remaining borrowing capacity	$ 436,848,000		$ 436,848,000			$ 436,848,000
Revolver due 2028 \| Letter of Credit Subfacility
Debt Instrument [Line Items]
Maximum borrowing capacity											125,000,000	100,000,000
Line of credit facility, incremental minimum borrowing amount											500,000,000	$ 375,000,000
Revolver due 2028 \| Multicurrency Subfacility
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 200,000,000
Revolver Due 2025, SOFR Loan
Debt Instrument [Line Items]
Interest rate (as percent)	5.51%		5.51%			5.51%
Revolver Due 2025, SONIA Loan
Debt Instrument [Line Items]
Interest rate (as percent)	5.51%		5.51%			5.51%
Revolver Due 2025, Base Rate Loan
Debt Instrument [Line Items]
Interest rate (as percent)	7.50%		7.50%			7.50%
Secured Overnight Financing Rate (SOFR) \| Revolver Due 2025, SOFR Loan
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			1.75%
SONIA \| Revolver Due 2025, SONIA Loan
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			1.75%
Base Rate \| Revolver Due 2025, Base Rate Loan
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			0.75%
Senior notes due 2028
Debt Instrument [Line Items]
Capitalized fees and expenses	$ 3,871,000		$ 3,871,000			$ 3,871,000	4,880,000
Long-term debt, gross	$ 974,775,000		$ 974,775,000			$ 974,775,000	$ 974,775,000
Interest rate (as percent)	5.75%		5.75%			5.75%	5.75%
Term Loan
Debt Instrument [Line Items]
Repayments of debt			$ 4,000,000
Term loan B due 2029
Debt Instrument [Line Items]
Capitalized fees and expenses	$ 3,084,000		3,084,000			$ 3,084,000	$ 4,169,000
Long-term debt, gross	387,000,000		387,000,000			387,000,000	$ 449,000,000
Term loan B due 2029 \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Long-term debt, fair value	387,484,000		387,484,000			387,484,000
Senior notes due 2022 \| Senior Notes
Debt Instrument [Line Items]
Repayments of debt					$ 1,000,000,000
Interest rate, stated (as percent)					5.25%
Senior notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Face amount					$ 1,000,000,000
Interest rate, stated (as percent)					5.75%
Capitalized fees and expenses					$ 16,448,000
Repurchased face amount													$ 25,225,000
Weighted average discount (as percent)													91.82%
Repurchase amount													$ 23,161,000
Debt issuance fees and expenses, net	3,871,000		3,871,000			3,871,000
Senior notes due 2028 \| Senior Notes \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Long-term debt, fair value	966,246,000		966,246,000			966,246,000
Term loan B due 2029 \| Term Loan
Debt Instrument [Line Items]
Face amount														$ 800,000,000
Repayments of debt			58,000,000			383,000,000
Debt issuance fees and expenses, net	$ 3,084,000		$ 3,084,000			$ 3,084,000
Debt instrument, issuance price (as percent)														99.75%
SOFR floor (as percent)									0.00%	0.50%
Interest rate (as percent)	5.66%		5.66%			5.66%
Principal payments	$ 2,000,000
Loss from debt extinguishment			$ 556,000
Write-off of underwriting fees and other expenses			500,000
Original issue discount			$ 56,000
Term loan B due 2029 \| Term Loan \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Margin above SOFR, period increase (decrease)								(0.25%)
Basis spread on variable rate (as percent)	2.00%

FAIR VALUE MEASUREMENTS	6 Months Ended
FAIR VALUE MEASUREMENTS	Mar. 31, 2026
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The carrying values of cash and equivalents, accounts receivable, accounts and notes payable, and revolving credit and variable interest rate debt approximate fair value due to either the short-term nature of such instruments or the fact that the interest rate of the revolving credit and variable rate debt is based upon current market rates. Applicable accounting guidance establishes a fair value hierarchy requiring the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the hierarchy is based on the lowest level of input that is significant to the fair value measurement. The accounting guidance establishes three levels of inputs that may be used to measure fair value, as follows: •Level 1 inputs are measured and recorded at fair value based upon quoted prices in active markets for identical assets. •Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities. •Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. On March 31, 2026, the fair values of Griffon’s Senior Notes and Term Loan B facility approximated $966,246 and $387,484, respectively. Fair values were based upon quoted market prices (Level 1 inputs). Insurance contracts with values of $5,325 at March 31, 2026 are measured and recorded at fair value based upon quoted prices in active markets for similar assets (Level 2 inputs) and are included in other assets on the Condensed Consolidated Balance Sheets. Items Measured at Fair Value on a Recurring Basis In the normal course of business, Griffon’s operations are exposed to the effects of changes in foreign currency exchange rates related to inventory purchases. To manage these risks, Griffon may enter into various derivative contracts such as foreign currency exchange contracts, including forwards and options. As of March 31, 2026, Griffon entered into several such contracts in order to lock into a foreign currency rate for planned settlements of trade liabilities payable in U.S. Dollars. At March 31, 2026, Griffon had $86,322 of Chinese Yuan contracts at a weighted average rate of $6.91 which qualified for hedge accounting (Level 2 inputs). These hedges were all deemed effective as cash flow hedges with gains and losses related to changes in fair value deferred and recorded in AOCI and Prepaid and other current assets, or Accrued liabilities, until settlement. Upon settlement, gains and losses are recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss) in COGS. AOCI included deferred gains of $199 ($144, net of tax) at March 31, 2026. Upon settlement, gains of $260 and $322 were recorded in COGS during the three and six months ended March 31, 2026. All contracts expire in 30 to 153 days.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES - CONTINUING OPERATIONS:
Net income	$ 83,705	$ 127,613
Net (income) loss from discontinued operations	18,804	(18,672)
Income from continuing operations	102,509	108,941
Adjustments to reconcile net income to net cash provided by operating activities - continuing operations:
Depreciation and amortization	19,581	19,091
Stock-based compensation	13,758	11,262
Provision (recovery) for losses on accounts receivable	216	(309)
Amortization of debt discounts and issuance costs	2,008	2,053
Loss from debt extinguishment	556	0
Pension and other post-retirement non-cash charges	3,940	570
Deferred income tax benefit	(124)	0
Change in assets and liabilities:
Increase in accounts receivable	(1,984)	(5,757)
Increase in inventories	(12,537)	(11,096)
Decrease in prepaid and other assets	797	6,463
Increase (decrease) in accounts payable, accrued liabilities and other liabilities	(9,899)	9,434
Other changes	(507)	(955)
Net cash provided by operating activities - continuing operations	118,314	139,697
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(17,652)	(25,938)
Other, net	0	137
Net cash used in investing activities - continuing operations	(17,652)	(25,801)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Dividends paid	(21,218)	(23,441)
Purchase of shares for treasury	(64,459)	(121,453)
Proceeds from long-term debt	50,000	63,000
Payments of long-term debt	(62,012)	(52,011)
Other, net	(69)	(27)
Net cash used in financing activities - continuing operations	(97,758)	(133,932)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by operating activities	10,913	19,437
Net cash provided by (used in) investing activities	(2,148)	12,341
Net cash used in financing activities	(60)	(68)
Net cash provided by discontinued operations	8,705	31,710
Effect of exchange rate changes on cash and equivalents	(982)	1,709
NET INCREASE IN CASH AND EQUIVALENTS	10,627	13,383
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	99,045	114,438
CASH AND EQUIVALENTS AT END OF PERIOD	109,672	127,821
Supplemental Disclosure of Non-Cash Flow Information:
Capital expenditures in accounts payable	$ 2,035	$ 1,150

CREDIT LOSSES

6 Months Ended

Mar. 31, 2026

Credit Loss [Abstract]

CREDIT LOSSES

The Company is exposed to credit losses primarily through sales of products and services. Trade receivables are recorded at their stated amount, less expected allowances for credit losses and, when appropriate, for customer program reserves and cash discounts. The Company’s expected loss allowance methodology for trade receivables is primarily based on the aging method of the accounts receivable balances and the financial condition of its customers. The expected allowance for credit losses represents estimated uncollectible receivables associated with potential customer defaults on contractual payment obligations (usually due to customers’ potential insolvency) and estimates for returns. As of March 31, 2026 and September 30, 2025, the allowance for credit losses includes an allowance for sales returns of $2,245 and $2,429, respectively. The allowance for credit losses includes amounts for certain customers where a risk of default has been specifically identified, as well as an amount for customer defaults, based on a formula, when it is determined the risk of some default is probable and estimable, but cannot yet be associated with specific customers. The provision related to the expected allowance for credit losses is recorded in SG&A expenses. The Company writes-off accounts receivable when they are deemed to be uncollectible.

The Company also considers current and expected future economic and market conditions when determining any estimate of credit losses. Generally, estimates used to determine the allowance are based on assessment of anticipated payment and all other historical, current and future information that is reasonably available. All accounts receivable amounts are expected to be collected in less than one year.

Based on a review of the Company's policies and procedures, including the aging of its trade receivables, recent write-off history and other factors related to future macroeconomic conditions, Griffon determined that its method to determine expected allowances for credit losses is in accordance with the accounting guidance for credit losses on financial instruments, including trade receivables, in all material respects.

The following table provides a roll-forward of the allowance for credit losses that is deducted from gross accounts receivable to present the net amount expected to be collected:


	Six Months Ended March 31,
	2026		2025
Beginning Balance, October 1	$	5,641	$	6,223

Provision for expected credit losses	216		(309)
Amounts written off charged against the allowance	(160)		(143)
Other	302		587
Ending Balance, March 31	$	5,999	$	6,358

OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ 94,447	$ 108,903	$ 73,972	$ 214,742	$ 227,776	$ 224,888
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(65,194)	$ (67,368)	(71,920)	$ (73,306)	$ (75,723)	$ (58,024)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(40,534)		(45,155)
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(23,633)		(27,488)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (1,027)		$ 723

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 16: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-2

+ Details

PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 6,381	$ 5,951	$ 12,239	$ 11,829
Selling, general and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 2,309	$ 2,508	$ 4,563	$ 4,964

GOODWILL AND OTHER INTANGIBLES - Schedule of Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 191,253	$ 191,253

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-41

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 740
-Name Accounting Standards Codification
-Section 55
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478064/805-740-55-13

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 39
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-39

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(15))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482598/350-20-45-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-4

+ Details

INCOME TAXES	6 Months Ended
INCOME TAXES	Mar. 31, 2026
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES During the quarter ended March 31, 2026, the Company recognized a tax provision of $18,038 on income before taxes from continuing operations of $64,975, compared to a tax provision of $17,782 on income before taxes from continuing operations of $67,587 in the prior year quarter. The current year quarter results includes the impact of retirement plan events of $1,609 ($1,225, net of tax); and discrete and certain other tax benefits, net, that affect comparability of $14. The prior year quarter results included strategic review costs - retention and other of $889 ($670, net of tax); and discrete and certain other tax benefits, net, that affect comparability of $1,006. Excluding these items, the effective tax rates for the quarters ended March 31, 2026 and 2025 were 27.7% and 27.8%, respectively. During the six months ended March 31, 2026, the Company recognized a tax provision of $38,189 on income before taxes from continuing operations of $140,698, compared to a tax provision of $38,516 on income before taxes from continuing operations of $147,457 in the comparable prior year period. The six month period ended March 31, 2026 included the impact of retirement plan events of $3,218 ($2,451, net of tax); loss from debt extinguishment of $556, ($423, net of tax); and discrete and other tax provisions, net, that affect comparability of $215. The six month period ended March 31, 2025 included strategic review costs - retention and other of $1,778 ($1,339, net of tax); and discrete and other tax benefits, net, that affect comparability of $1,134. Excluding these items, the effective tax rate for both the six months ended March 31, 2026 and 2025 was 26.9%. Subsequent to the actions discussed in Note 1, the Company has recorded a deferred tax liability of $13,865 relating to the outside book to tax difference of North America discontinued operations, offset by a deferred tax asset of $22,086 relating to the outside book to tax basis difference in foreign discontinued operations. Under ASC 740-30, the Company is no longer permanently reinvested in the discontinued operations of Canada, Australia, and U.K.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

CREDIT LOSSES (Tables)

6 Months Ended

Mar. 31, 2026

Credit Loss [Abstract]

Schedule of Rollforward of Allowance for Credit Losses

The following table provides a roll-forward of the allowance for credit losses that is deducted from gross accounts receivable to present the net amount expected to be collected:


	Six Months Ended March 31,
	2026		2025
Beginning Balance, October 1	$	5,641	$	6,223

Provision for expected credit losses	216		(309)
Amounts written off charged against the allowance	(160)		(143)
Other	302		587
Ending Balance, March 31	$	5,999	$	6,358

INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 77,867	$ 71,742
Work in process	9,439	9,193
Finished goods	96,857	90,812
Total	$ 184,163	$ 171,747

EARNINGS PER SHARE (EPS) - Schedule of Reconciliation of Share Amounts Used in Computing Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Common shares outstanding (in shares)	46,115	47,231	46,115	47,231
Non-vested restricted stock (in shares)	(1,801)	(1,611)	(1,801)	(1,611)
Impact of weighted average shares (in shares)	302	38	322	(22)
Weighted average shares outstanding - basic (in shares)	44,616	45,658	44,636	45,598
Incremental shares from stock-based compensation (in shares)	1,074	1,242	1,091	1,628
Weighted average shares outstanding - diluted (in shares)	45,690	46,900	45,727	47,226
Common Stock Shares Issued Not Disclosed			true
Number of Authorized Shares Not Disclosed			true

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies)	6 Months Ended
	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information, and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all the information and footnotes required by US GAAP for complete financial statements. As such, they should be read together with Griffon’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, which provides a more complete explanation of Griffon’s accounting policies, financial position, operating results, business, properties and other matters. In the opinion of management, these financial statements reflect all adjustments considered necessary for a fair statement of interim results. Griffon’s businesses are seasonal; for this and other reasons, the financial results of the Company for any interim period are not necessarily indicative of the results for the full year. The Condensed Consolidated Balance Sheet information at September 30, 2025 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2025. The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain amounts in prior years may have been reclassified to conform to the current year presentation. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. These estimates may be adjusted due to changes in economic, industry or customer financial conditions, as well as changes in technology or demand. Significant estimates include expected loss allowances for credit losses and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, assumptions associated with pension benefit obligations and income or expenses, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, assumptions associated with stock based compensation valuation, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations and the accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions Griffon may undertake in the future. Actual results may ultimately differ from these estimates.
Fair Value Measurements	The carrying values of cash and equivalents, accounts receivable, accounts and notes payable, and revolving credit and variable interest rate debt approximate fair value due to either the short-term nature of such instruments or the fact that the interest rate of the revolving credit and variable rate debt is based upon current market rates. Applicable accounting guidance establishes a fair value hierarchy requiring the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the hierarchy is based on the lowest level of input that is significant to the fair value measurement. The accounting guidance establishes three levels of inputs that may be used to measure fair value, as follows: •Level 1 inputs are measured and recorded at fair value based upon quoted prices in active markets for identical assets. •Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities. •Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
Inventories	Inventories are stated at the lower of cost (first-in, first-out or average cost) or net realizable value.
Issued but not yet effective accounting pronouncements	Issued but not yet effective accounting pronouncements In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The new standard was issued to improve transparency and decision usefulness of income tax disclosures by providing information that helps investors better understand how an entity's operations, tax risks, tax planning and operational opportunities affect its tax rate and future cash flows. The standard requires significant additional disclosures focused on income taxes paid and the rate reconciliation table. Specifically, the amendments in the standard require the Company to disclose disaggregated: (1) income taxes paid by federal, state, and foreign, (2) continuing operations pre-tax income between domestic and foreign, and (3) continuing operations income tax expense by federal, state and foreign. The standard also requires the Company to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This standard is effective for the Company beginning with our fiscal year 2026 annual reporting period, and can be applied prospectively or retrospectively. While the Company is currently evaluating the guidance to determine the impact it may have on its condensed consolidated financial statements, the Company does not expect the adoption of this standard to have a material impact on its financial position, results of operations, or cash flows. In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update require disclosures and further disaggregation, in the notes to financial statements, of specified information regarding certain costs and expenses. The required disclosures include the amounts of purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depreciation, depletion, and amortization recognized as part of oil and gas producing activities included in each relevant expense caption. Additionally, further disclosures are required for certain amounts already required to be disclosed under current GAAP, a qualitative description of amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and the total amount of selling expenses, and on an annual basis, the definition of selling expenses. The ASU is effective for the Company beginning with the Company's fiscal year 2028 and interim reporting periods beginning with the Company's 2029 fiscal year. Implementation of this standard may be applied prospectively or retrospectively. The Company is currently evaluating this guidance to determine the impact it may have on its condensed consolidated financial statements.
Consolidation, Policy	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information, and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all the information and footnotes required by US GAAP for complete financial statements. As such, they should be read together with Griffon’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, which provides a more complete explanation of Griffon’s accounting policies, financial position, operating results, business, properties and other matters. In the opinion of management, these financial statements reflect all adjustments considered necessary for a fair statement of interim results. Griffon’s businesses are seasonal; for this and other reasons, the financial results of the Company for any interim period are not necessarily indicative of the results for the full year. The Condensed Consolidated Balance Sheet information at September 30, 2025 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2025. The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain amounts in prior years may have been reclassified to conform to the current year presentation.

- Definition

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.

+ References + Details

EARNINGS PER SHARE (EPS)

6 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

EARNINGS PER SHARE (EPS)

Basic EPS was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding during the period. Diluted EPS was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding plus additional common shares that could be issued in connection with stock-based compensation.

The following table is a reconciliation of the share amounts (in thousands) used in computing earnings per share:


	Three Months Ended March 31,		Six Months Ended March 31,
	2026	2025	2026	2025
Common shares outstanding	46,115	47,231	46,115	47,231

Non-vested restricted stock	(1,801)	(1,611)	(1,801)	(1,611)
Impact of weighted average shares	302	38	322	(22)
Weighted average shares outstanding - basic	44,616	45,658	44,636	45,598
Incremental shares from stock-based compensation	1,074	1,242	1,091	1,628
Weighted average shares outstanding - diluted	45,690	46,900	45,727	47,226

DISCONTINUED OPERATIONS

6 Months Ended

Mar. 31, 2026

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

On February 5, 2026, Griffon announced it entered into a definitive agreement to form a joint venture with ONCAP, the mid-market private equity platform of Onex Corporation (TSX:ONEX), to create a leading global provider of hand tools, home organization solutions, and lawn and garden products for professionals and consumers. The joint venture will combine the United States and Canada businesses of Griffon’s AMES Companies (“AMES”) with the Bellota Tools, Corona, and Burgon & Ball businesses of Venanpri, an ONCAP majority-owned portfolio company. The joint venture will be managed as a subsidiary of Venanpri which, together with other affiliates of ONCAP, will hold a 57% equity interest. Upon closing of the transaction, Griffon will receive consideration of $100,000 in cash, subject to working capital adjustments, will enter into a credit agreement with the joint venture to evidence a $161,100 second-lien loan provided to the joint venture, and will participate in the governance and oversight of the joint venture as a 43% equity holder. Griffon will accrue interest receivable on the second-lien loan through the date of maturity. The joint venture will be financed through committed debt financing, in addition to the second-lien loan provided by Griffon. This transaction is subject to customary closing conditions and, after closing, which is expected to occur by the end of June 2026, Griffon’s interest in the joint venture will be accounted for as an equity method investment. As of March 31, 2026, the Company recorded a loss of $22,648 on assets held for sale because the carrying value of the U.S. and Canada businesses of the AMES Companies is greater than its estimated fair value less its cost to sell.

Griffon also announced on February 5, 2026 the initiation of a comprehensive review of strategic alternatives for its AMES Australia and United Kingdom ("U.K.") operations. The strategic process for AMES Australia is active and ongoing and we expect to complete the process by the end of the calendar year. As of March 31, 2026, the Company ceased its AMES U.K. operations and will liquidate its assets and settle its liabilities. As a result of these actions, AMES’ U.S., Canada, Australia, and U.K. operations have been reported as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented. Except for certain U.K. assets and liabilities not held for sale, we classified the assets and liabilities associated with the AMES' U.S., Canada, Australia and U.K. discontinued operations as held for sale in the Condensed Consolidated Balance Sheets. The U.K. assets classified as held for sale relate to inventory and property, plant and equipment that will be sold in liquidation. Accordingly, all references made to results and information in this Quarterly Report on Form 10-Q are to Griffon's continuing operations, unless specifically noted otherwise. In accordance with ASC 205-20 Presentation of Financial Statements: Discontinued Operations, a disposal of a component of an entity or a group of components of an entity is required to be reported as discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results when the component of an entity meets the held for sale criteria or is disposed of other than by sale. In the period in which the component meets the discontinued operations criteria, the major current assets, other assets, current liabilities, and noncurrent liabilities shall be reported as components of total assets and liabilities separate from those balances of the continuing operations except as noted above for certain U.K. assets and liabilities not held for sale. At the same time, the results of all discontinued operations, less applicable income taxes (benefit), shall be reported as components of net income (loss) separate from the net income (loss) of continuing operations.

The following amounts related to AMES have been segregated from Griffon's continuing operations and are reported as discontinued operations:


	For the Three Months Ended March 31,					For the Six Months Ended March 31,
	2026		2025			2026		2025
Revenue	$	206,349		$	185,062	$	401,177	$	373,979
Cost of goods and services	159,777			131,197		296,573		267,226
Gross profit	46,572			53,865		104,604		106,753
Selling, general and administrative expenses	62,178			43,587		106,264		88,721


Income (loss) from discontinued operations	(15,606)			10,278		(1,660)		18,032
Other income (expense):
Gain on sale of real estate	—			183		—		8,157
Interest income, net	141			394		150		653
Loss on expected sale of U.S. and Canada businesses	(22,648)			—		(22,648)		—
Other, net	343			195		631		1,758
Total other income (expense)	(22,164)			772		(21,867)		10,568
Income (loss) from discontinued operations before taxes	$	(37,770)		$	11,050	$	(23,527)	$	28,600
Provision (benefit) for income taxes	(10,151)			4,093		(4,723)		9,928
Income (loss) from discontinued operations	$	(27,619)		$	6,957	$	(18,804)	$	18,672

As of March 31, 2026, the Company has ceased business operations of the AMES Companies in the U.K. and recorded charges totaling $27,328 consisting of non-cash asset impairment charges of $21,282 and cash charges related to personnel-related costs and vendor agreement terminations of $6,046. Non-cash asset impairment charges of $21,282 related to intangible asset impairments of $6,609, and inventory and fixed asset write-down charges of $7,340 and $7,333, respectively, that have no recoverable value. In total, $15,751 was recorded within selling, general and administrative expenses in discontinued operations and $11,577 was recorded within cost of goods and services in discontinued operations.

As of March 31, 2026, the Company recorded an expected loss of $22,648 ($31,099, including tax provision) on assets held for sale because the carrying value of the U.S. and Canada businesses of the AMES Companies is greater than its estimated fair value less its cost to sell. The tax carrying value of these businesses is less than its estimated fair value less costs to sell, resulting in a tax provision of $8,451. The loss consists of a write-down of $14,332 to the carrying value of the U.S. and Canada businesses to their fair value and $8,316 associated with the estimated costs to sell AMES' U.S. and Canada in connection with the anticipated joint venture transaction. Griffon recorded an additional $5,287 of legal and consulting costs related to the sale of the joint venture, which is included in selling, general and administrative expenses in discontinued operations.

For the three and six months ended March 31, 2026, depreciation and amortization for property, plant and equipment was $2,389 and $8,574, respectively. Depreciation and amortization ceased for AMES' U.S., Canada and Australia operations from the time they were classified as a discontinued operation, in accordance with accounting guidelines. Depreciation and amortization excluded in both the three and six months ended March 31, 2026 was $3,576. Depreciation and amortization would have been $5,965 and $12,150 for the three and six months ended March 31, 2026, respectively. For the three and six months ended March 31, 2025, depreciation and amortization was $6,058 and $12,173, respectively.

For the three and six months ended March 31, 2026, ROU asset amortization was $1,451 and $5,762, respectively. ROU asset amortization ceased for the AMES' U.S., Canada and Australia operations from the time they were classified as a discontinued operation, in accordance with accounting guidelines. ROU asset amortization excluded in both the three and six months ended March 31, 2026 was $2,931. ROU asset amortization would have been $4,382 and $8,693 for the three and six months ended March 31, 2026, respectively. For the three and six months ended March 31, 2025, amortization on operating leases was $4,180 and $8,512, respectively.

The following amounts related to the AMES discontinued operations have been segregated from Griffon’s continuing operations, and are reported as assets and liabilities of discontinued operations in the Condensed Consolidated Balance Sheets:


	At March 31, 2026		At September 30,
	2026		2025
CURRENT ASSETS
Cash and equivalents	$	—	$	—
Accounts receivable, net	102,956		93,850

Inventories	247,588		269,025
Prepaid and other current assets	13,918		12,282
PROPERTY, PLANT AND EQUIPMENT, net	94,710		103,187
OPERATING LEASE RIGHT-OF-USE ASSETS	112,903		114,788
GOODWILL	1,664		1,664
INTANGIBLE ASSETS, net	122,758		124,159
OTHER ASSETS	21,906		16,861

VALUATION ALLOWANCE(1)	(22,648)		—
Total Assets Held for Sale	$	695,755	$	735,816
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	$	84	$	70
Accounts payable	65,267		79,822
Accrued liabilities	37,702		42,034
Current portion of operating lease liabilities	17,575		16,834
LONG-TERM DEBT, net	236		110
LONG-TERM OPERATING LEASE LIABILITIES	101,303		106,750
OTHER LIABILITIES	4,756		4,770
Total Liabilities Held for Sale	$	226,923	$	250,390

_______________________________________

(1) The Company recorded a loss of $22,648 consisting of a write-down of $14,332 for the carrying value of assets to its fair value and $8,316 associated with the estimated costs to sell for AMES' United States and Canada in connection with the anticipated joint venture transaction.

LEASES - Schedule of Components of Operating Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Lease Cost
Fixed	$ 4,808	$ 5,478	$ 10,197	$ 10,694
Variable	1,872	1,899	3,508	3,810
Short-term	363	285	903	537
Total	$ 7,043	$ 7,662	$ 14,608	$ 15,041

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($)
$ in Thousands

Total

COMMON STOCK

CAPITAL IN EXCESS OF PAR VALUE

RETAINED EARNINGS

TREASURY SHARES

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

DEFERRED COMPENSATION

Beginning balance (in shares) at Sep. 30, 2024

84,746,000

Beginning balance at Sep. 30, 2024

$ 224,888

$ 21,187

$ 677,028

$ 461,442

$ (876,527)

$ (58,024)

$ (218)

Beginning balance (in shares) at Sep. 30, 2024

36,443,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

70,851

Dividend

(8,196)

Shares withheld on employee taxes on vested equity awards (in shares)

64,000

Shares withheld on employee taxes on vested equity awards

(5,342)

$ (5,342)

Amortization of deferred compensation

218

Common stock acquired including excise taxes (in shares)

610,000

Common stock acquired including excise taxes

(42,963)

$ (42,963)

Equity awards granted, net (in shares)

(493,000)

Equity awards granted, net

(12,136)

$ 12,136

ESOP allocation of common stock

641

537

104

Stock-based compensation(1)

5,378

Other comprehensive income, net of tax

(17,699)

Ending balance (in shares) at Dec. 31, 2024

84,746,000

Ending balance at Dec. 31, 2024

227,776

$ 21,187

670,807

524,097

$ (912,592)

(75,723)

Ending balance (in shares) at Dec. 31, 2024

36,624,000

Beginning balance (in shares) at Sep. 30, 2024

84,746,000

Beginning balance at Sep. 30, 2024

224,888

$ 21,187

677,028

461,442

$ (876,527)

(58,024)

(218)

Beginning balance (in shares) at Sep. 30, 2024

36,443,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

127,613

Other comprehensive income, net of tax

$ (15,282)

Ending balance (in shares) at Mar. 31, 2025

47,231,000

84,746,000

Ending balance at Mar. 31, 2025

$ 214,742

$ 21,187

676,084

572,365

$ (981,588)

(73,306)

Ending balance (in shares) at Mar. 31, 2025

37,515,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Employee Benefits and Share-Based Compensation

11,893

Total operating expenses

631

Beginning balance (in shares) at Dec. 31, 2024

84,746,000

Beginning balance at Dec. 31, 2024

227,776

$ 21,187

670,807

524,097

$ (912,592)

(75,723)

Beginning balance (in shares) at Dec. 31, 2024

36,624,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

56,762

Dividend

(8,494)

Shares withheld on employee taxes on vested equity awards (in shares)

520,000

Shares withheld on employee taxes on vested equity awards

(39,407)

$ (39,407)

Common stock acquired including excise taxes (in shares)

420,000

Common stock acquired including excise taxes

(30,827)

$ (30,827)

Equity awards granted, net (in shares)

(49,000)

Equity awards granted, net

(1,238)

$ 1,238

Stock-based compensation(1)

^[1]

6,515

Other comprehensive income, net of tax

$ 2,417

2,417

Ending balance (in shares) at Mar. 31, 2025

47,231,000

84,746,000

Ending balance at Mar. 31, 2025

$ 214,742

$ 21,187

676,084

572,365

$ (981,588)

(73,306)

$ 0

Ending balance (in shares) at Mar. 31, 2025

37,515,000

Beginning balance (in shares) at Sep. 30, 2025

84,746,000

Beginning balance at Sep. 30, 2025

73,972

$ 21,187

690,153

479,048

$ (1,044,496)

(71,920)

Beginning balance (in shares) at Sep. 30, 2025

38,400,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

64,387

Dividend

(10,089)

Shares withheld on employee taxes on vested equity awards (in shares)

160,000

Shares withheld on employee taxes on vested equity awards

(11,846)

$ (11,846)

Common stock acquired including excise taxes (in shares)

247,000

Common stock acquired including excise taxes

(18,500)

$ (18,500)

Equity awards granted, net (in shares)

(634,000)

Equity awards granted, net

(17,345)

$ 17,345

Stock-based compensation(1)

6,427

Other comprehensive income, net of tax

4,552

Ending balance (in shares) at Dec. 31, 2025

84,746,000

Ending balance at Dec. 31, 2025

108,903

$ 21,187

679,235

533,346

$ (1,057,497)

(67,368)

Ending balance (in shares) at Dec. 31, 2025

38,173,000

Beginning balance (in shares) at Sep. 30, 2025

84,746,000

Beginning balance at Sep. 30, 2025

73,972

$ 21,187

690,153

479,048

$ (1,044,496)

(71,920)

Beginning balance (in shares) at Sep. 30, 2025

38,400,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

$ 83,705

Shares withheld on employee taxes on vested equity awards (in shares)

166,160

Other comprehensive income, net of tax

$ 6,726

Ending balance (in shares) at Mar. 31, 2026

46,115,000

84,746,000

Ending balance at Mar. 31, 2026

$ 94,447

$ 21,187

687,878

542,660

$ (1,092,084)

(65,194)

Ending balance (in shares) at Mar. 31, 2026

38,631,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Employee Benefits and Share-Based Compensation

14,238

Total operating expenses

480

Beginning balance (in shares) at Dec. 31, 2025

84,746,000

Beginning balance at Dec. 31, 2025

108,903

$ 21,187

679,235

533,346

$ (1,057,497)

(67,368)

Beginning balance (in shares) at Dec. 31, 2025

38,173,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

19,318

Dividend

$ (10,004)

(10,004)

Shares withheld on employee taxes on vested equity awards (in shares)

6,304

6,000

Shares withheld on employee taxes on vested equity awards

$ (485)

Common stock acquired including excise taxes (in shares)

422,000

Common stock acquired including excise taxes

(33,270)

$ (33,270)

Equity awards granted, net (in shares)

30,000

Equity awards granted, net

832

$ (832)

Stock-based compensation(1)

^[2]

7,811

Other comprehensive income, net of tax

$ 2,174

2,174

Ending balance (in shares) at Mar. 31, 2026

46,115,000

84,746,000

Ending balance at Mar. 31, 2026

$ 94,447

$ 21,187

$ 687,878

$ 542,660

$ (1,092,084)

$ (65,194)

Ending balance (in shares) at Mar. 31, 2026

38,631,000

[1]	For the six months ended March 31, 2025, stock-based compensation expense of $11,893 reflected in the Condensed Consolidated Statement of Shareholders' equity includes approximately $631 of stock-based compensation expense that is recorded within discontinued operations in our Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Cash Flows.
[2]	For the six months ended March 31, 2026, stock-based compensation expense of $14,238 reflected in the Condensed Consolidated Statements of Shareholders' equity includes approximately $480 of stock-based compensation expense that is recorded within discontinued operations in our Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Cash Flows.

Insider Trading Arrangements

3 Months Ended

6 Months Ended

Mar. 31, 2026

Trading Arrangements, by Individual

Material Terms of Trading Arrangement

During the fiscal quarter ended March 31, 2026, the following trading plans were adopted by the executive officers listed below. Each such plan is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c), as amended.


Executive	Date of Adoption of Plan	Aggregate Number of Shares of Common Stock to be sold pursuant to Trading Arrangement	Period of Plan

Robert F. Mehmel, President and Chief Operating Officer	February 12, 2026	100,000	May 14, 2026 - May 31, 2027

Brian G. Harris, Executive Vice President and Chief Financial Officer	February 12, 2026	30,000	May 14, 2026 - May 10, 2027

Non-Rule 10b5-1 Arrangement Adopted

false

Rule 10b5-1 Arrangement Terminated

false

Non-Rule 10b5-1 Arrangement Terminated

false

Robert F. Mehmel [Member]

Trading Arrangements, by Individual

Name

Robert Mehmel

Title

Chief Operating Officer

Rule 10b5-1 Arrangement Adopted

true

February 12, 2026

May 31, 2027

382 days

100,000

Brian G. Harris [Member]

Trading Arrangements, by Individual

Name

Brian Harris

Title

Executive Vice President and Chief Financial Officer

Rule 10b5-1 Arrangement Adopted

true

February 12, 2026

May 31, 2027

382 days

30,000

COMMITMENTS AND CONTINGENCIES (Details)	6 Months Ended
COMMITMENTS AND CONTINGENCIES (Details)	Mar. 31, 2026
Peekskill, NY
Loss Contingencies [Line Items]
Site contingency, ownership period (in years)	3 years
Memphis, TN
Loss Contingencies [Line Items]
Site contingency, ownership period (in years)	50 years
Site contingency, site vacant period (in years)	20 years

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483359/720-20-50-1

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

+ Details

PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

The following table details the components of property, plant and equipment, net:


	At March 31, 2026		At September 30, 2025
Land, building and building improvements	$	101,877	$	100,415
Machinery and equipment(1)	360,058		343,029
Leasehold improvements	30,346		30,341
	492,281		473,785
Accumulated depreciation	(289,644)		(277,835)
Total	$	202,637	$	195,950

(1) Machinery and equipment includes approximately $22,163 and $31,078 of construction in progress assets as of March 31, 2026 and September 30, 2025, respectively.

Depreciation and amortization expense for property, plant and equipment was $6,381 and $5,951 for the quarters ended March 31, 2026 and 2025, respectively, and $12,239 and $11,829 for the six months ended March 31, 2026 and 2025, respectively. Depreciation and amortization included in Selling, general and administrative ("SG&A") expenses were $2,309 and $2,508 for the quarters ended March 31, 2026 and 2025, respectively and $4,563 and $4,964 for the six months ended March 31, 2026 and 2025, respectively. Remaining components of depreciation and amortization, attributable to manufacturing operations, are included in Cost of goods and services.

During the six months ended March 31, 2026, no event or indicator of impairment occurred which would require testing of property, plant and equipment related to continuing operations.

DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Jun. 30, 2026	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2026
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Possible tax loss				$ 8,451
Loss consists of write-down				14,332
Estimated costs to sell				8,316
Acquisition costs				5,287
Depreciation and amortization expense	$ 6,381	$ 5,951		12,239	$ 11,829
Carrying value of credit and debt card receivables	31,099			31,099
Forecast \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from organization of joint venture			$ 100,000
Notes issued			$ 161,100
ONCAP \| Forecast \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity interest (as percent)						57.00%
Griffon \| Forecast \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity interest (as percent)						43.00%
Cost of goods and services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				11,577
Assets of discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				15,751
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				21,282
Discontinued Operations \| Personnel related costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for restructuring				6,046
Discontinued Operations \| Intangible Asset Impairments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				6,609
Discontinued Operations \| Inventory Write-down
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				7,340
Global Sourcing Strategy Expansion \| Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges				27,328
Global Sourcing Strategy Expansion \| Discontinued Operations \| Fixed Asset Write-down Charges
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash charges				7,333
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization expense	2,389			8,574
Depreciation if not discontinued	5,965			12,150
Depreciation and amortization excluded	3,576			3,576
Depreciation and amortization expense		6,058			12,173
Amortization	1,451			5,762
Lease amortization excluded	2,931			2,931
Amortization if not discontinued	$ 4,382	$ 4,180		$ 8,693	$ 8,512

LONG-TERM DEBT (Tables)

6 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Debt

Debt at March 31, 2026 and September 30, 2025 consisted of the following:


		At March 31, 2026										At September 30, 2025
		Outstanding Balance		Original Issuer Premium/(Discount)		Capitalized Fees & Expenses		Balance Sheet		Coupon Interest Rate			Outstanding Balance		Original Issuer Premium/(Discount)		Capitalized Fees & Expenses		Balance Sheet		Coupon Interest Rate
Senior notes due 2028	(a)	$	974,775	$	97	(3,871)		$	971,001	5.75	%		$	974,775	$	121	$	(4,880)	$	970,016	5.75	%
Term loan B due 2029	(b)	387,000		(341)		(3,084)		383,575		Variable			449,000		(461)		(4,169)		444,370		Variable
Revolver due 2028	(b)	50,000		—		(1,740)		48,260		Variable			—		—		(2,113)		(2,113)		Variable
Other debt	(c)	18		—		—		18		Variable			36		—		—		36		Variable
Totals		1,411,793		(244)		(8,695)		1,402,854					1,423,811		(340)		(11,162)		1,412,309
less: Current portion		(8,018)		—		—		(8,018)					(8,033)		—		—		(8,033)
Long-term debt		$	1,403,775	$	(244)	$	(8,695)	$	1,394,836				$	1,415,778	$	(340)	$	(11,162)	$	1,404,276

Interest expense for the three and six months ended March 31, 2026 and 2025 consists of the following:


		Three Months Ended March 31, 2026										Three Months Ended March 31, 2025
		Effective Interest Rate		Cash Interest		Amort. Debt (Premium)/Discount		Amort. Debt Issuance Costs & Other Fees		Total Interest Expense		Effective Interest Rate		Cash Interest		Amort. Debt (Premium)/Discount		Amort. Debt Issuance Costs & Other Fees		Total Interest Expense
Senior notes due 2028	(a)	6.0	%	$	14,012	$	(12)	$	504	$	14,504	6.0	%	$	14,020	$	(12)	$	505	$	14,513
Term Loan B due 2029	(b)	6.1	%	5,515		30		272		5,817		6.8	%	7,328		34		312		7,674
Revolver due 2028	(b)	Variable		657		—		187		844		Variable		1,669		—		187		1,856

Other long term debt	(d)	Variable		8		—		—		8		Variable		33		—		—		33
Capitalized interest				(36)		—		—		(36)				(219)		—		—		(219)
Totals				$	20,156	$	18	$	963	$	21,137			$	22,831	$	22	$	1,004	$	23,857

(a) During 2020, Griffon issued, at par, $1,000,000 of 5.75% Senior Notes due 2028 (the “Senior Notes”). Proceeds from the Senior Notes were used to redeem $1,000,000 of 5.25% Senior Notes due in 2022. In connection with the issuance and exchange of the Senior Notes, Griffon capitalized $16,448 of underwriting fees and other expenses incurred, which is being amortized over the term of such notes. During 2022, Griffon purchased $25,225 of Senior Notes in the open market at a weighted average discount of 91.82% of par, or $23,161. As of March 31, 2026, outstanding Senior Notes due totaled $974,775; interest is payable semi-annually on March 1 and September 1.

The Senior Notes are senior unsecured obligations of Griffon guaranteed by certain domestic subsidiaries, and subject to certain covenants, limitations and restrictions. The Senior Notes were registered under the Securities Act of 1933, as amended (the "Securities Act") via an exchange offer. The fair value of the Senior Notes approximated $966,246 on March 31, 2026 based upon quoted market prices (Level 1 inputs). At March 31, 2026, $3,871 of underwriting fees and other expenses incurred remained to be amortized.

(b) On January 24, 2022, Griffon amended and restated its Credit Agreement (the "Credit Agreement") to provide for a new $800,000 Term Loan B facility, due January 24, 2029, in addition to the revolving credit facility (the "Revolver") provided for under the Credit Agreement. The Term Loan B facility was issued at 99.75% of par value. Additionally, during 2024 Griffon further amended its Credit Agreement to favorably reprice the Term Loan B facility. The amendment reduced the margin above Secured Overnight Financing Rate ("SOFR") by 0.25%, eliminated the credit spread adjustment and reduced the SOFR floor from 0.50% to 0%.

The Term Loan B bears interest at the Term SOFR rate plus a spread of 2.00% (5.66% as of March 31, 2026). The Term Loan B facility continues to require nominal quarterly principal payments of $2,000, potential additional annual principal payments based on a percentage of excess cash flow and certain secured leverage thresholds and a final balloon payment due at maturity. Term Loan B borrowings may generally be repaid without penalty. Once repaid, Term Loan B borrowings may not be reborrowed. The Term Loan B facility is subject to the same affirmative and negative covenants that apply to the Revolver (as described below), but is not subject to any financial maintenance covenants. Term Loan B borrowings are secured by the same collateral that secures borrowings under the Revolver, on an equal and ratable basis. The fair value of the Term Loan B facility approximated $387,484 on March 31, 2026 based upon quoted market prices (Level 1 inputs).

During the six months ended March 31, 2026, Griffon prepaid $58,000 of the aggregate principal amount outstanding under the Term Loan B facility, in addition to the required principal payments of $4,000. In connection with this prepayment Griffon recognized a $556 loss on debt extinguishment, $500 related to the write-off of underwriting fees and other expenses and $56 of the original issue discount. Since the inception of the loan, Griffon has prepaid $383,000 aggregate principal amount of the Term Loan B, which permanently reduced the outstanding balance. As of March 31, 2026, the Term Loan B outstanding balance was $387,000. At March 31, 2026, unamortized costs of $3,084 related to existing and new Term Loan B facility lenders will continue to be amortized over the term of the loan.

On August 1, 2023, Griffon amended and restated the Credit Agreement to increase the maximum borrowing availability under the Revolver from $400,000 to $500,000 and extend the maturity date of the Revolver from March 22, 2025 to August 1, 2028. In the event the Senior Notes are not repaid, refinanced, or replaced prior to December 1, 2027, the Revolver will mature on December 1, 2027. The amendment also modified certain other provisions of the Credit Agreement, including increasing the letter of credit sub-facility under the Revolver from $100,000 to $125,000 and increasing the customary accordion feature from a minimum of $375,000 to a minimum of $500,000. The Revolver also includes a multi-currency sub-facility of $200,000.

Borrowings under the Revolver may be repaid and re-borrowed at any time. Interest is payable on borrowings at either a SOFR, Sterling Overnight Index Average ("SONIA") or base rate benchmark rate, plus an applicable margin, which adjusts based on financial performance. Griffon's SOFR loans accrue interest at Term SOFR plus a credit adjustment spread and a margin of 1.75% (5.51% at March 31, 2026); SONIA loans accrue interest at SONIA Base Rate plus a credit adjustment spread and a margin of 1.75% (5.51% at March 31, 2026); and base rate loans accrue interest at prime rate plus a margin of 0.75% (7.50% at March 31, 2026).

At March 31, 2026, under the Credit Agreement, there was $50,000 in outstanding borrowings on the Revolver; outstanding standby letters of credit were $13,152; and $436,848 was available, subject to certain loan covenants, for borrowing at that date.

The Revolver has certain financial maintenance tests including a maximum total leverage ratio, a maximum senior secured leverage ratio and a minimum interest coverage ratio, as well as customary affirmative and negative covenants and events of default. The negative covenants place limits on Griffon's ability to, among other things, incur indebtedness, incur liens, and make restricted payments and investments. Both the Revolver and Term Loan B borrowings under the Credit Agreement are guaranteed by Griffon’s material domestic subsidiaries and are secured, on a first priority basis, by substantially all domestic assets of the Company and the guarantors.

DISCONTINUED OPERATIONS (Tables)

6 Months Ended

Mar. 31, 2026

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Assets and Liabilities of Discontinued Operations Reported in Condensed Consolidated Balance Sheets

The following amounts related to AMES have been segregated from Griffon's continuing operations and are reported as discontinued operations:


	For the Three Months Ended March 31,					For the Six Months Ended March 31,
	2026		2025			2026		2025
Revenue	$	206,349		$	185,062	$	401,177	$	373,979
Cost of goods and services	159,777			131,197		296,573		267,226
Gross profit	46,572			53,865		104,604		106,753
Selling, general and administrative expenses	62,178			43,587		106,264		88,721


Income (loss) from discontinued operations	(15,606)			10,278		(1,660)		18,032
Other income (expense):
Gain on sale of real estate	—			183		—		8,157
Interest income, net	141			394		150		653
Loss on expected sale of U.S. and Canada businesses	(22,648)			—		(22,648)		—
Other, net	343			195		631		1,758
Total other income (expense)	(22,164)			772		(21,867)		10,568
Income (loss) from discontinued operations before taxes	$	(37,770)		$	11,050	$	(23,527)	$	28,600
Provision (benefit) for income taxes	(10,151)			4,093		(4,723)		9,928
Income (loss) from discontinued operations	$	(27,619)		$	6,957	$	(18,804)	$	18,672


	At March 31, 2026		At September 30,
	2026		2025
CURRENT ASSETS
Cash and equivalents	$	—	$	—
Accounts receivable, net	102,956		93,850

Inventories	247,588		269,025
Prepaid and other current assets	13,918		12,282
PROPERTY, PLANT AND EQUIPMENT, net	94,710		103,187
OPERATING LEASE RIGHT-OF-USE ASSETS	112,903		114,788
GOODWILL	1,664		1,664
INTANGIBLE ASSETS, net	122,758		124,159
OTHER ASSETS	21,906		16,861

VALUATION ALLOWANCE(1)	(22,648)		—
Total Assets Held for Sale	$	695,755	$	735,816
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	$	84	$	70
Accounts payable	65,267		79,822
Accrued liabilities	37,702		42,034
Current portion of operating lease liabilities	17,575		16,834
LONG-TERM DEBT, net	236		110
LONG-TERM OPERATING LEASE LIABILITIES	101,303		106,750
OTHER LIABILITIES	4,756		4,770
Total Liabilities Held for Sale	$	226,923	$	250,390

_______________________________________

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-11

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-3A

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4A

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4B

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5A

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5D

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 20
-Topic 205
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-1

Reference 15: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-3

+ Details

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
INCOME TAXES (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Provision for income taxes from continuing operations	$ 18,038	$ 17,782	$ 38,189	$ 38,516
Income before taxes from continuing operations	64,975	$ 67,587	140,698	147,457
Retirement plan events	1,609
Retirement plan events, net of tax	$ 1,225
Effective tax rate (percent)	27.70%	27.80%
Strategic review costs- retention and other		$ 889
Other tax provision (benefit) that affect comparability	$ (14)	1,006	(215)	(1,134)
Loss from debt extinguishment, net of tax			$ 2,451
Strategic review cost - retention and other, net of tax		$ 670		$ 1,339
Effective tax rate (as percent)			26.90%	26.90%
Effective income tax rate reconciliation, special dividend ESOP charges			$ 556
Effective income tax rate reconciliation, special dividend ESOP charges, net of tax			423
Strategic review costs- retention and other				$ 1,778
Deferred tax liability related to outside book to tax difference	13,865		13,865
Deferred tax asset related to outside book to tax difference	$ 22,086		$ 22,086

GOODWILL AND OTHER INTANGIBLES

6 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLES

The carrying value of goodwill as of March 31, 2026 and September 30, 2025 was $191,253.

The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:


	At March 31, 2026					At September 30, 2025
	Gross Carrying Amount		Accumulated Amortization		Average Life (Years)	Gross Carrying Amount		Accumulated Amortization
Customer relationships & other	$	272,692	$	61,886	15	$	284,984	$	61,291
Technology, patents & other	6,637		4,061		3	7,707		4,038
Total amortizable intangible assets	279,329		65,947			292,691		65,329
Trademarks	136,593		—			136,593		—
Total intangible assets	$	415,922	$	65,947		$	429,284	$	65,329

Amortization expense for intangible assets was $3,682 and $3,642 for the quarters ended March 31, 2026 and 2025, respectively and $7,342 and $7,262 for the six months ended March 31, 2026 and 2025, respectively. Amortization expense for the remainder of 2026 and the next five fiscal years and thereafter, based on current intangible balances and classifications, is estimated as follows: remaining in 2026 - $7,410; 2027 - $14,800; 2028 - $14,800; 2029 - $14,800; 2030 - $14,800; 2031 - $14,800; thereafter $131,972.

Indicators of impairment related to the Company's continuing operations Goodwill and Intangible Assets were not present during the six months ended March 31, 2026 and 2025.

Cover Page - shares	6 Months Ended
Cover Page - shares	Mar. 31, 2026	Apr. 30, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-06620
Entity Registrant Name	GRIFFON CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	11-1893410
Entity Address, Address Line One	712 Fifth Ave, 18th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	212
Local Phone Number	957-5000
Title of 12(b) Security	Common Stock, $0.25 par value
Trading Symbol	GFF
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		45,866,631
Current Fiscal Year End Date	--09-30
Amendment Flag	false
Entity Central Index Key	0000050725
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q2

LEASES

6 Months Ended

Mar. 31, 2026

Leases [Abstract]

LEASES

The Company recognizes right-of-use ("ROU") assets and lease liabilities on the balance sheet, with the exception of leases with a term of twelve months or less. The Company determines if an arrangement is a lease at inception. The ROU assets and short and long-term liabilities associated with our Operating leases are shown as separate line items on our Condensed Consolidated Balance Sheets. Finance leases are included in property, plant, and equipment, net, and the related finance lease obligations are presented within debt on our Condensed Consolidated Balance Sheets. The Company's finance leases are immaterial. ROU assets, along with any other related long-lived assets, are periodically evaluated for impairment.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. Lease payments primarily include rent and insurance costs (lease components). The Company's leases also include non-lease components such as real estate taxes and common-area maintenance costs. The Company elected the practical expedient to account for lease and non-lease components as a single component. In certain of the Company's leases, the non-lease components are variable and in accordance with the standard are therefore excluded from lease payments to determine the ROU asset. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. We use the implicit rate when readily determinable. Our determination of the lease term may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

For operating leases, fixed lease payments are recognized as operating lease cost on a straight-line basis over the lease term. For finance leases, the ROU asset is included in property, plant and equipment, net and is depreciated on a straight-line basis over the remaining lease term, along with recognition of interest expense associated with accretion of the lease liability. For leases with a lease term of 12 months or less (a "Short-term" lease), any fixed lease payments are recognized on a straight-line basis over such term, and are not recognized on the Condensed Consolidated Balance Sheets. Variable lease costs are recognized as incurred. Components of operating lease costs are as follows:


	For the Three Months Ended March 31,				For the Six Months Ended March 31,
	2026		2025		2026		2025
Fixed	$	4,808	$	5,478	$	10,197	$	10,694
Variable (a), (b)	1,872		1,899		3,508		3,810
Short-term (b)	363		285		903		537
Total	$	7,043	$	7,662	$	14,608	$	15,041

________________

(a) Primarily relates to common-area maintenance and property taxes.

(b) Not recorded on the balance sheet.

Supplemental cash flow information was as follows:


	For the Six Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,183	$	8,678
Financing cash flows from finance leases	13		12
Total	$	9,196	$	8,690


Right of use assets obtained in exchange for new lease obligations:
Operating leases	$	24,467	$	11,301
Finance leases	—		—
Total	$	24,467	$	11,301

Supplemental Condensed Consolidated Balance Sheet information related to leases was as follows:


	March 31, 2026		September 30, 2025
Operating Leases:
Right of use assets:
Operating right-of-use assets	$	68,355	$	53,041

Lease Liabilities:
Current portion of operating lease liabilities	$	17,232	$	15,473
Long-term operating lease liabilities	55,201		40,453
Total operating lease liabilities	$	72,433	$	55,926

Finance Leases:
Property, plant and equipment, net(1)	$	16	$	27

Lease Liabilities:
Notes payable and current portion of long-term debt	$	18	$	31
Long-term debt, net	—		5
Total financing lease liabilities	$	18	$	36

(1) Finance lease assets are recorded net of accumulated depreciation of $78 and $66 as of March 31, 2026 and September 30, 2025, respectively.

The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2026 are as follows:


	Operating Leases		Finance Leases
2026(a)	$	10,532	$	14
2027	19,085		4
2028	15,166		—
2029	12,084		—
2030	9,371		—
2031	4,631		—
Thereafter	14,008		—
Total lease payments	$	84,877	$	18
Less: imputed interest	(12,444)		—
Present value of lease liabilities	$	72,433	$	18

(a) Excluding the six months ended March 31, 2026.

Average lease terms and discount rates at March 31, 2026 were as follows:


Weighted-average remaining lease term (years):
Operating Leases						5.50
Finance Leases						0.67

Weighted-average discount rate:
Operating Leases						6.05%
Finance Leases						7.29%

LEASES


	For the Three Months Ended March 31,				For the Six Months Ended March 31,
	2026		2025		2026		2025
Fixed	$	4,808	$	5,478	$	10,197	$	10,694
Variable (a), (b)	1,872		1,899		3,508		3,810
Short-term (b)	363		285		903		537
Total	$	7,043	$	7,662	$	14,608	$	15,041

________________

(a) Primarily relates to common-area maintenance and property taxes.

(b) Not recorded on the balance sheet.

Supplemental cash flow information was as follows:


	For the Six Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,183	$	8,678
Financing cash flows from finance leases	13		12
Total	$	9,196	$	8,690


Right of use assets obtained in exchange for new lease obligations:
Operating leases	$	24,467	$	11,301
Finance leases	—		—
Total	$	24,467	$	11,301

Supplemental Condensed Consolidated Balance Sheet information related to leases was as follows:


	March 31, 2026		September 30, 2025
Operating Leases:
Right of use assets:
Operating right-of-use assets	$	68,355	$	53,041

Lease Liabilities:
Current portion of operating lease liabilities	$	17,232	$	15,473
Long-term operating lease liabilities	55,201		40,453
Total operating lease liabilities	$	72,433	$	55,926

Finance Leases:
Property, plant and equipment, net(1)	$	16	$	27

Lease Liabilities:
Notes payable and current portion of long-term debt	$	18	$	31
Long-term debt, net	—		5
Total financing lease liabilities	$	18	$	36

(1) Finance lease assets are recorded net of accumulated depreciation of $78 and $66 as of March 31, 2026 and September 30, 2025, respectively.

The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2026 are as follows:


	Operating Leases		Finance Leases
2026(a)	$	10,532	$	14
2027	19,085		4
2028	15,166		—
2029	12,084		—
2030	9,371		—
2031	4,631		—
Thereafter	14,008		—
Total lease payments	$	84,877	$	18
Less: imputed interest	(12,444)		—
Present value of lease liabilities	$	72,433	$	18

(a) Excluding the six months ended March 31, 2026.

Average lease terms and discount rates at March 31, 2026 were as follows:


Weighted-average remaining lease term (years):
Operating Leases						5.50
Finance Leases						0.67

Weighted-average discount rate:
Operating Leases						6.05%
Finance Leases						7.29%

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances	$ 5,999	$ 5,641

OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Other income (expense)	$ (1,238)	$ 317	$ (2,616)	$ 586
Net currency exchange gains	134	(6)	283	(276)
Net periodic benefit plan expense	2,002	40	4,003	81
Net gains (losses) on investments	122	(16)	(7)	54
Royalty income	445	556	964	1,146
Charges associated with establishment of new retiree medical plan	3,218		3,218
Other Operating Income (Expense)
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit plan expense	$ 1,908	$ 40	$ 3,815	$ 81

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-7

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (m)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

+ Details

LEASES - Schedule of Supplemental Condensed Consolidated Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Operating Leases:
Operating right-of-use assets	$ 68,355	$ 53,041
Lease Liabilities:
Current portion of operating lease liabilities	17,232	15,473
Long-term operating lease liabilities	55,201	40,453
Total operating lease liabilities	72,433	55,926
Finance Leases:
Property, plant and equipment, net	$ 16	$ 27
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	PROPERTY, PLANT AND EQUIPMENT, net	PROPERTY, PLANT AND EQUIPMENT, net
Lease Liabilities:
Notes payable and current portion of long-term debt	$ 18	$ 31
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Notes payable and current portion of long-term debt	Notes payable and current portion of long-term debt
Long-term debt, net	$ 0	$ 5
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-Term Debt, Excluding Current Maturities	Long-Term Debt, Excluding Current Maturities
Total financing lease liabilities	$ 18	$ 36
Accumulated depreciation	$ 78	$ 66

LEASES (Tables)

6 Months Ended

Mar. 31, 2026

Leases [Abstract]

Schedule of Components of Operating Lease Costs, Supplemental Cash Flow Information, and Average Lease Terms and Discount Rates

Components of operating lease costs are as follows:


	For the Three Months Ended March 31,				For the Six Months Ended March 31,
	2026		2025		2026		2025
Fixed	$	4,808	$	5,478	$	10,197	$	10,694
Variable (a), (b)	1,872		1,899		3,508		3,810
Short-term (b)	363		285		903		537
Total	$	7,043	$	7,662	$	14,608	$	15,041

________________

(a) Primarily relates to common-area maintenance and property taxes.

(b) Not recorded on the balance sheet.

Supplemental cash flow information was as follows:


	For the Six Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,183	$	8,678
Financing cash flows from finance leases	13		12
Total	$	9,196	$	8,690


Right of use assets obtained in exchange for new lease obligations:
Operating leases	$	24,467	$	11,301
Finance leases	—		—
Total	$	24,467	$	11,301

Average lease terms and discount rates at March 31, 2026 were as follows:


Weighted-average remaining lease term (years):
Operating Leases						5.50
Finance Leases						0.67

Weighted-average discount rate:
Operating Leases						6.05%
Finance Leases						7.29%

Schedule of Supplemental Condensed Consolidated Balance Sheet Information Related to Leases

Supplemental Condensed Consolidated Balance Sheet information related to leases was as follows:


	March 31, 2026		September 30, 2025
Operating Leases:
Right of use assets:
Operating right-of-use assets	$	68,355	$	53,041

Lease Liabilities:
Current portion of operating lease liabilities	$	17,232	$	15,473
Long-term operating lease liabilities	55,201		40,453
Total operating lease liabilities	$	72,433	$	55,926

Finance Leases:
Property, plant and equipment, net(1)	$	16	$	27

Lease Liabilities:
Notes payable and current portion of long-term debt	$	18	$	31
Long-term debt, net	—		5
Total financing lease liabilities	$	18	$	36

(1) Finance lease assets are recorded net of accumulated depreciation of $78 and $66 as of March 31, 2026 and September 30, 2025, respectively.

Schedule of Aggregate Future Maturities of Lease Payments for Operating Leases

The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2026 are as follows:


	Operating Leases		Finance Leases
2026(a)	$	10,532	$	14
2027	19,085		4
2028	15,166		—
2029	12,084		—
2030	9,371		—
2031	4,631		—
Thereafter	14,008		—
Total lease payments	$	84,877	$	18
Less: imputed interest	(12,444)		—
Present value of lease liabilities	$	72,433	$	18

(a) Excluding the six months ended March 31, 2026.

Schedule of Aggregate Future Maturities of Lease Payments for Finance Leases

The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2026 are as follows:


	Operating Leases		Finance Leases
2026(a)	$	10,532	$	14
2027	19,085		4
2028	15,166		—
2029	12,084		—
2030	9,371		—
2031	4,631		—
Thereafter	14,008		—
Total lease payments	$	84,877	$	18
Less: imputed interest	(12,444)		—
Present value of lease liabilities	$	72,433	$	18

(a) Excluding the six months ended March 31, 2026.

REVENUE	6 Months Ended
REVENUE	Mar. 31, 2026
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE The Company recognizes revenue when performance obligations identified under the terms of contracts with its customers are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting. A contract with a customer is an agreement which both parties have approved, that creates enforceable rights and obligations, has commercial substance and with respect to which payment terms are identified and collectability is probable. Once the Company has entered into a contract or purchase order, it is evaluated to identify performance obligations. For each performance obligation, revenue is recognized when control of the promised products is transferred to the customer, or services are satisfied under the contract or purchase order, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products or services (the transaction price). The Company’s performance obligations are recognized at a point in time related to the manufacture and sale of a broad range of products and components, and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer, which is generally upon shipment. For a complete explanation of Griffon’s revenue accounting policies, this note should be read in conjunction with Griffon’s Annual Report on Form 10-K for the year ended September 30, 2025. See Note 12 - Reportable Segment for revenue from contracts with customers disaggregated by end markets.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

REPORTABLE SEGMENTS (Tables)

6 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Disaggregation of Revenue by End Market and Segment

The following table presents revenue disaggregated by end market:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025
Residential repair and remodel(1)	$	220,766	$	226,716	$	464,767	$	465,561
Commercial	170,626		168,387		348,406		339,143
Residential new construction(1)	30,468		31,581		62,947		65,433
Total	$	421,860	$	426,684	$	876,120	$	870,137

_____________________

(1) The breakout between residential new construction and residential repair and remodel contains certain management assumptions, such as customer and product type.

CREDIT LOSSES (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Credit Loss [Abstract]
Allowance for sales returns	$ 2,245	$ 2,429

COMMITMENTS AND CONTINGENCIES	6 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal and environmental Peekskill Site. Lightron Corporation (“Lightron”), a wholly-owned subsidiary of Griffon, once conducted lamp manufacturing and metal finishing operations at a location in the Town of Cortlandt, New York, just outside the city of Peekskill, New York (the “Peekskill Site”) which was owned by ISC Properties, Inc. (“ISCP”), a wholly-owned subsidiary of Griffon, for approximately three years. ISCP sold the Peekskill Site in December 1982. Based upon studies conducted by ISCP and the New York Department of Environmental Conservation, soils and groundwater beneath the Peekskill Site contain chlorinated solvents and metals. Stream sediments downgradient from the Peekskill Site also contain metals. On May 15, 2019 the United States Environmental Protection Agency ("EPA") added the Peekskill Site to the National Priorities List under CERCLA and has since reached agreement with Lightron and ISCP pursuant to which Lightron and ISCP will perform a Remedial Investigation/Feasibility Study (“RI/FS”). Performance of the RI/FS is expected to be completed in 2027. Lightron has not engaged in any operations in over three decades. ISCP functioned solely as a real estate holding company and has not held any real property in over three decades. Griffon does not acknowledge any responsibility to perform any investigation or remediation at the Peekskill Site. Lightron and ISCP are being defended by an insurance company, subject to a reservation of rights, and the insurance company is paying the costs of the RI, with Lightron and ISCP paying for the FS. Memphis, TN site. Hunter Fan Company (“Hunter”) operated headquarters and a production plant in Memphis, TN for over 50 years (the “Memphis Site”). While Hunter completed certain on-site remediation of PCB-contaminated soils, Hunter did not investigate the extent to which PCBs existed beneath the building itself nor determine whether off-site areas had been impacted. Hunter vacated the site approximately twenty years ago, and the on-site buildings have now been demolished. The State of Tennessee Department of Environment and Conservation (“TDEC”) identified the Memphis site as being potentially contaminated, raising the possibility that site operations could have resulted in soil and groundwater contamination involving volatile organic compounds and metals. In 2021, the TDEC performed a preliminary assessment of the site and recommended to the EPA that it include the site on the National Priorities List established under CERCLA. The TDEC further recommended that the EPA fund an investigation of potential soil gas contamination in receptors near the site. The TDEC has also indicated that it will proceed with this investigation if the EPA does not act. Since 2021, there has been no further action by the EPA or TDEC relating to the Memphis site. It is unknown whether the EPA will add the Memphis Site to the National Priorities List, whether a site investigation will reveal contamination and, if there is contamination, the extent of any such contamination. However, given that certain PCB work was not completed in the past and the TDEC’s stated intent for the EPA to perform an investigation (and the statement by the TDEC that it will perform the investigation if the EPA will not), liability is probable in this matter. There are other potentially responsible parties for this site, including a former owner of Hunter; Hunter has notified such former owner of this matter. If the EPA decides to add this site to the National Priorities List, a Remedial Investigation/Feasibility Study (“RI/FS”) will be required. Hunter expects that the EPA will ask it to perform this work. If Hunter does not reach an agreement with the EPA to perform this work, the EPA will implement the RI/FS on its own. Should the EPA implement the RI/FS or perform further studies and/or subsequently remediate the site without first reaching an agreement with one or more relevant parties, the EPA would likely seek reimbursement from such parties, including Hunter, for the costs incurred. General legal Griffon is subject to various laws and regulations relating to the protection of the environment and is a party to legal proceedings arising in the ordinary course of business. Management believes, based on facts presently known to it, that the resolution of the matters above and such other matters will not have a material adverse effect on Griffon’s consolidated financial position, results of operations or cash flows.

DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating expenses			$ 480	$ 631
Income (loss) from discontinued operations before taxes	$ (37,770)	$ 11,050	(23,527)	28,600
Provision (benefit) for income taxes	(10,151)	4,093	(4,723)	9,928
Defense Electronics \| Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	206,349	185,062	401,177	373,979
Cost of goods and services	159,777	131,197	296,573	267,226
Gross profit	46,572	53,865	104,604	106,753
Selling, general and administrative expenses	62,178	43,587	106,264	88,721
Income (loss) from discontinued operations	(15,606)	10,278	(1,660)	18,032
Gain on sale of real estate	0	183	0	8,157
Interest income, net	141	394	150	653
Loss on expected sale of U.S. and Canada businesses	(22,648)	0	(22,648)	0
Other, net	343	195	631	1,758
Total other income (expense)	(22,164)	772	(21,867)	10,568
Income (loss) from discontinued operations before taxes	(37,770)	11,050	(23,527)	28,600
Provision (benefit) for income taxes	(10,151)	4,093	(4,723)	9,928
Income (loss) from discontinued operations	$ (27,619)	$ 6,957	$ (18,804)	$ 18,672

INVENTORIES (Tables)

6 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Schedule of Components of Inventory

The following table details the components of inventory:


	At March 31, 2026		At September 30, 2025
Raw materials and supplies	$	77,867	$	71,742
Work in process	9,439		9,193
Finished goods	96,857		90,812
Total	$	184,163	$	171,747

EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Schedule of Defined Benefit Pension Income Included in Other Income (Expense)

Defined benefit pension and other post-retirement benefit plan expenses are as follows:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025

Service cost	$	94	$	—	$	188	$	—
Interest cost	525		645		1,050		1,291
Expected return on plan assets	(587)		(890)		(1,175)		(1,780)
Amortization:

Prior service cost	1,609		—		3,218		—
Recognized actuarial loss	361		285		722		570

Net periodic benefit plan expense	$	2,002	$	40	$	4,003	$	81

LONG-TERM DEBT

6 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

LONG-TERM DEBT

Debt at March 31, 2026 and September 30, 2025 consisted of the following:


		At March 31, 2026										At September 30, 2025
		Outstanding Balance		Original Issuer Premium/(Discount)		Capitalized Fees & Expenses		Balance Sheet		Coupon Interest Rate			Outstanding Balance		Original Issuer Premium/(Discount)		Capitalized Fees & Expenses		Balance Sheet		Coupon Interest Rate
Senior notes due 2028	(a)	$	974,775	$	97	(3,871)		$	971,001	5.75	%		$	974,775	$	121	$	(4,880)	$	970,016	5.75	%
Term loan B due 2029	(b)	387,000		(341)		(3,084)		383,575		Variable			449,000		(461)		(4,169)		444,370		Variable
Revolver due 2028	(b)	50,000		—		(1,740)		48,260		Variable			—		—		(2,113)		(2,113)		Variable
Other debt	(c)	18		—		—		18		Variable			36		—		—		36		Variable
Totals		1,411,793		(244)		(8,695)		1,402,854					1,423,811		(340)		(11,162)		1,412,309
less: Current portion		(8,018)		—		—		(8,018)					(8,033)		—		—		(8,033)
Long-term debt		$	1,403,775	$	(244)	$	(8,695)	$	1,394,836				$	1,415,778	$	(340)	$	(11,162)	$	1,404,276

Interest expense for the three and six months ended March 31, 2026 and 2025 consists of the following:


		Three Months Ended March 31, 2026										Three Months Ended March 31, 2025
		Effective Interest Rate		Cash Interest		Amort. Debt (Premium)/Discount		Amort. Debt Issuance Costs & Other Fees		Total Interest Expense		Effective Interest Rate		Cash Interest		Amort. Debt (Premium)/Discount		Amort. Debt Issuance Costs & Other Fees		Total Interest Expense
Senior notes due 2028	(a)	6.0	%	$	14,012	$	(12)	$	504	$	14,504	6.0	%	$	14,020	$	(12)	$	505	$	14,513
Term Loan B due 2029	(b)	6.1	%	5,515		30		272		5,817		6.8	%	7,328		34		312		7,674
Revolver due 2028	(b)	Variable		657		—		187		844		Variable		1,669		—		187		1,856

Other long term debt	(d)	Variable		8		—		—		8		Variable		33		—		—		33
Capitalized interest				(36)		—		—		(36)				(219)		—		—		(219)
Totals				$	20,156	$	18	$	963	$	21,137			$	22,831	$	22	$	1,004	$	23,857

At March 31, 2026, Griffon and its subsidiaries were in compliance with the terms and covenants of its credit and loan agreements.

EMPLOYEE BENEFIT PLANS

6 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

Defined benefit pension and other post-retirement benefit plan expenses are as follows:


	Three Months Ended March 31,				Six Months Ended March 31,
	2026		2025		2026		2025

Service cost	$	94	$	—	$	188	$	—
Interest cost	525		645		1,050		1,291
Expected return on plan assets	(587)		(890)		(1,175)		(1,780)
Amortization:

Prior service cost	1,609		—		3,218		—
Recognized actuarial loss	361		285		722		570

Net periodic benefit plan expense	$	2,002	$	40	$	4,003	$	81

The defined benefit pension and other post-retirement benefit plan expenses in the above table were recorded in Other, net on the Condensed Consolidated Statement of Operations and Comprehensive Income (Loss), except for service costs, which were recorded in selling, general and administrative expenses.

Included in the above table, is the new retiree medical plan for certain Griffon executives, which was effective August 5, 2025. Under the plan, eligible retirees and their covered spouses are provided company-paid medical, prescription drug and dental coverage through the Company's group health plans (or if such coverage cannot be provided, an equivalent benefit), along with reimbursement for certain uncovered expenses.

During the quarter and six months ended March 31, 2026, the Company recognized a benefit plan expense of $1,794 and $3,588, respectively, which includes a non-cash charge of $1,609 and $3,218, respectively, related to the implementation of this retiree medical plan. The Company expects to record non-cash charges related to implementation of the plan of $5,362 in 2026.

During 2025, the Company completed the termination of the Hunter Pension Plan (the "Plan"). In connection with such termination the Plan made lump sum payments of $4,830, and placed $10,859 of assets with an annuity provider, based on the elections of the participants. Additionally, excess cash of $6,100 was transferred to the Company, a portion of which was transferred directly to a qualified replacement plan. In 2025, the Company recognized a gain on the termination of the Plan of $2,181, net of excise taxes, in the Consolidated Statements of Operations and Comprehensive Income (Loss).

GOODWILL AND OTHER INTANGIBLES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 3,682	$ 3,642	$ 7,342	$ 7,262
Amortization expense estimated for remaining period in 2026	7,410		7,410
Amortization expense estimated for 2027	14,800		14,800
Amortization expense estimated for 2028	14,800		14,800
Amortization expense estimated for 2029	14,800		14,800
Amortization expense estimated for 2030	14,800		14,800
Amortization expense estimated for 2031	14,800		14,800
Amortization expense estimated thereafter	$ 131,972		$ 131,972

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-11

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-24

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-12

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482686/350-30-45-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

+ Details

LONG-TERM DEBT - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Cash Interest	$ 20,156	$ 22,831
Capitalized interest	(36)	(219)	$ (204)	$ (366)
Cash Interest			41,122	46,642
Amort. Debt (Premium)/Discount	18	22	41	45
Amort. Debt Issuance Costs & Other Fees	963	1,004	1,967	2,008
Total Interest Expense	$ 21,137	$ 23,857	$ 43,130	$ 48,695
Senior notes due 2028
Debt Instrument [Line Items]
Effective Interest Rate	6.00%	6.00%	6.00%	6.00%
Cash Interest	$ 14,012	$ 14,020	$ 28,024	$ 28,032
Amort. Debt (Premium)/Discount	(12)	(12)	(24)	(24)
Amort. Debt Issuance Costs & Other Fees	504	505	1,009	1,010
Total Interest Expense	$ 14,504	$ 14,513	$ 29,009	$ 29,018
Term loan B due 2029
Debt Instrument [Line Items]
Effective Interest Rate	6.10%	6.80%	6.20%	7.00%
Cash Interest	$ 5,515	$ 7,328	$ 12,388	$ 15,383
Amort. Debt (Premium)/Discount	30	34	65	69
Amort. Debt Issuance Costs & Other Fees	272	312	585	625
Total Interest Expense	5,817	7,674	13,038	16,077
Revolver due 2028
Debt Instrument [Line Items]
Cash Interest	657	1,669	905	3,546
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	187	187	373	373
Total Interest Expense	844	1,856	1,278	3,919
Other debt
Debt Instrument [Line Items]
Cash Interest			9	47
Amort. Debt (Premium)/Discount			0	0
Amort. Debt Issuance Costs & Other Fees			0	0
Total Interest Expense			$ 9	$ 47
Other debt
Debt Instrument [Line Items]
Cash Interest	8	33
Amort. Debt (Premium)/Discount	0	0
Amort. Debt Issuance Costs & Other Fees	0	0
Total Interest Expense	$ 8	$ 33

SHAREHOLDERS' EQUITY AND EQUITY COMPENSATION	6 Months Ended
SHAREHOLDERS' EQUITY AND EQUITY COMPENSATION	Mar. 31, 2026
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY AND EQUITY COMPENSATION	SHAREHOLDERS’ EQUITY AND EQUITY COMPENSATION During the six months ended March 31, 2026, the Company paid two quarterly cash dividends of $0.22 per share. During fiscal year 2025, the Company paid four quarterly cash dividends of $0.18 per share, totaling $0.72. For all dividends, a dividend payable is established for the holders of restricted shares; such dividends will be released upon vesting of the underlying restricted shares. At March 31, 2026, accrued dividends were $1,836. The Company currently intends to pay dividends each quarter; however, payment of dividends is determined by the Board of Directors at its discretion based on various factors, and no assurance can be provided as to the payment of future dividends. Dividends paid on shares in Griffon's Employee Stock Ownership Plan (the “ESOP”) through December 31, 2024 were used to offset ESOP loan payments and recorded as a reduction of debt service payments and compensation expense. The ESOP loan was paid in full as of December 31, 2024 and dividends paid after that date are paid in cash directly to participant accounts. The ESOP was frozen as of September 30, 2024; this means that, for plan years after this date, no additional employees will become participants under the ESOP and no new voluntary contributions will be made to the ESOP. Prior to this date, all U.S. employees of Griffon, who were not members of a collective bargaining unit, were automatically eligible to participate in the plan on the October 1st following completion of one qualifying year of service (as defined in the plan). During the first quarter of fiscal 2025, the final loan payment was made by the ESOP to the Company and compensation expense for the period was fully offset by dividends paid. As of March 31, 2026, there were 3,777,638 shares of common stock in the ESOP, all of which were allocated to participant accounts. On May 6, 2026, the Board of Directors declared a quarterly cash dividend of $0.22 per share, payable on June 17, 2026 to shareholders of record as of the close of business on May 29, 2026. On January 29, 2016, shareholders approved the Griffon Corporation 2016 Equity Incentive Plan (the "Original Incentive Plan") pursuant to which, among other things, awards of performance shares, performance units, stock options, stock appreciation rights, restricted shares, restricted stock units, deferred shares and other stock-based awards may be granted. On January 31, 2018, shareholders approved Amendment No. 1 to the Original Incentive Plan pursuant to which, among other things, 1,000,000 shares were added to the Original Incentive Plan; on January 30, 2020, shareholders approved Amendment No. 2 to the Original Incentive Plan, pursuant to which 1,700,000 shares were added to the Original Incentive Plan; on February 17, 2022, shareholders approved the Amended and Restated 2016 Equity Incentive Plan (the “Amended Incentive Plan”), which amended and restated the Original Incentive Plan and pursuant to which, among other things, 1,200,000 shares were added to the Original Incentive Plan; and on March 20, 2024, shareholders approved an amendment to add 2,600,000 shares to the Amended Incentive Plan. Options granted under the Amended Incentive Plan may be either “incentive stock options” or nonqualified stock options, generally expire ten years after the date of grant and are granted at an exercise price of not less than 100% of the fair market value at the date of grant. The maximum number of shares of common stock available for award under the Amended Incentive Plan is 8,850,000 (600,000 of which may be issued as incentive stock options), plus (i) any shares that were reserved for issuance under the Original Incentive Plan as of the effective date of the Original Incentive Plan, and (ii) any shares underlying awards outstanding on such date under the 2011 Incentive Plan that were subsequently canceled or forfeited. As of March 31, 2026, there were 1,316,946 shares available for grant. Compensation expense for restricted stock and restricted stock units is recognized ratably over the required service period based on the fair value of the grant, calculated as the number of shares or units granted multiplied by the stock price on the date of grant, and for performance shares, including performance units, the likelihood of achieving the performance criteria. The Company recognizes forfeitures as they occur. Compensation expense for restricted stock granted to four senior executives is calculated as the target number of shares granted, upon achieving certain performance criteria or market conditions multiplied by the grant date fair value. The Monte Carlo Simulation Model is used to estimate the grant-date fair value of restricted stock awards that include market conditions. Compensation cost related to stock-based awards with graded vesting, generally over a period of three years, is recognized using the straight-line attribution method and recorded within SG&A expenses. The Company’s compensation expense relating to all stock-based incentive plans was $7,688 and $6,182 for the three months ended March 31, 2026 and 2025, respectively, and $13,758 and $11,262 for the six months ended March 31, 2026 and 2025, respectively. During the first quarter of 2026, Griffon granted 147,398 shares of restricted stock and restricted stock units to 29 executives and key employees, subject to certain performance conditions, with a vesting period of thirty-six months and a total fair value of $9,855, or a weighted average fair value of $66.86 per share. During the first quarter of 2026, Griffon also granted 531,456 shares of restricted stock to four senior executives with a vesting period of thirty-six months and a two-year post-vesting holding period, subject to the achievement of certain performance conditions relating to required levels of return on invested capital and the relative total shareholder return of Griffon's common stock as compared to a market index. So long as the minimum performance conditions are attained, the amount of shares that can vest will range from a minimum of 88,578 to a maximum of 531,456, with the target number of shares being 177,152. The total estimated fair value of these restricted shares, assuming achievement of the performance conditions at target, is $14,326, or a weighted average fair value of $80.87 per share (based on the target number of shares). During the second quarter of 2026, Griffon granted 13,400 shares of restricted stock to non-employee directors of Griffon with a vesting period of one year and a fair value of $1,200, or a weighted average fair value of $89.52 per share. Subsequent to the second quarter of 2026, Griffon granted 5,401 shares of restricted stock to one executive with a vesting period of sixty months and a total fair value of $500, or a weighted average fair value of $92.58 per share. On November 13, 2024, Griffon announced that the Board of Directors approved an increase of $400,000 to its share repurchase authorization. Under the authorized share repurchase program, the Company may, from time to time, purchase shares of its common stock in the open market, including pursuant to a 10b5-1 plan, pursuant to an accelerated share repurchase program or issuer tender offer, or in privately negotiated transactions. Share repurchases during the quarter and six months ended March 31, 2026 totaled 422,151 and 668,888 shares of common stock, respectively, for a total of $32,940 and $51,003, respectively, or an average of $78.03 and $76.25 per share, respectively. This excludes excise taxes incurred for share repurchases of $329 and $510, respectively, for the quarter and six months ended March 31, 2026, respectively. As of March 31, 2026, $247,010 remains available under Griffon's Board authorized repurchase program. During the quarter and six months ended March 31, 2026, 6,304 and 166,160 shares, respectively, with a market value of $515 or $81.77 per share and $12,505 or $75.26 per share, respectively, were withheld to settle employee taxes due upon the vesting of restricted stock, and were added to treasury stock. This excludes excise tax benefits of $30 and $173 for the quarter and six months ended March 31, 2026, respectively.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

+ Details

REPORTABLE SEGMENTS - Narrative (Details) - segment	3 Months Ended		6 Months Ended
REPORTABLE SEGMENTS - Narrative (Details) - segment	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Number of reportable segments			1
Long-Lived Assets \| Customer Concentration Risk \| United States
Segment Reporting Information [Line Items]
Concentration risk (as percent)	96.00%	96.00%	96.00%	95.00%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2025	Mar. 31, 2026	Mar. 31, 2026	Sep. 30, 2025	Sep. 30, 2026
Defined Benefit Plan Disclosure [Line Items]
Benefit plan expense		$ 1,794	$ 3,588
Benefits, losses and expenses, non-cash		$ 1,609	$ 3,218
Lump sum distribution for plan termination				$ 4,830
Plan assets, decrease for assets transferred from plan	$ 6,100			10,859
Gain from plan termination				$ 2,181
Forecast
Defined Benefit Plan Disclosure [Line Items]
Non-cash charge related to implementation					$ 5,362

- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit	$ (18,038)		$ (17,782)		$ (38,189)	$ (38,516)
Net income	19,318	$ 64,387	56,762	$ 70,851	83,705	127,613
Total \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	(1,710)		(673)		(3,618)	(1,178)
Tax benefit	359		141		760	247
Net income	(1,351)		(532)		(2,858)	(931)
Pension amortization \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	(1,970)		(285)		(3,940)	(570)
Cash flow hedges \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	$ 260		$ (388)		$ 322	$ (608)

- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-SubTopic 20
-Topic 740
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-SubTopic 10
-Topic 235
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-10

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-4

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)(d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 105
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 9
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479343/105-10-65-9

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 17
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480336/718-10-65-17

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 19: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-6

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-3

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-7

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 34: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 37: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 38: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 39: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 40: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 41: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 42: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 43: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 44: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 45: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 46: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 47: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 48: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 49: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

FAIR VALUE MEASUREMENTS (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($) $ / shares
Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of insurance contracts	$ 5,325	$ 5,325
Chinese Yuan Contracts \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	86,322	$ 86,322
Weighted average rate (in dollars per share) \| $ / shares		$ 6.91
Deferred gain (loss), foreign currency translation adjustment, before tax	199	$ 199
Deferred gain (loss), foreign currency translation adjustment, net of tax	144	144
Gain on hedging activity		$ 322
Chinese Yuan Contracts \| Designated as Hedging Instrument \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of contract (in days)		30 days
Chinese Yuan Contracts \| Designated as Hedging Instrument \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of contract (in days)		153 days
Chinese Yuan Contracts \| Designated as Hedging Instrument \| Cost of goods and services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) reclassified for settled contracts	(260)
Fair Value, Inputs, Level 1 \| Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	387,484	$ 387,484
Senior notes due 2028 \| Fair Value, Inputs, Level 1 \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 966,246	$ 966,246

GOODWILL AND OTHER INTANGIBLES (Tables)

6 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Gross Carrying Value and Accumulated Amortization of Intangible Assets

The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:


	At March 31, 2026					At September 30, 2025
	Gross Carrying Amount		Accumulated Amortization		Average Life (Years)	Gross Carrying Amount		Accumulated Amortization
Customer relationships & other	$	272,692	$	61,886	15	$	284,984	$	61,291
Technology, patents & other	6,637		4,061		3	7,707		4,038
Total amortizable intangible assets	279,329		65,947			292,691		65,329
Trademarks	136,593		—			136,593		—
Total intangible assets	$	415,922	$	65,947		$	429,284	$	65,329

LEASES - Schedule of Aggregate Future Maturities of Lease Payments for Operating and Finance Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Operating Leases
2026	$ 10,532
2027	19,085
2028	15,166
2029	12,084
2030	9,371
2031	4,631
Thereafter	14,008
Total lease payments	84,877
Less: imputed interest	(12,444)
Present value of lease liabilities	72,433	$ 55,926
Finance Leases
2026	14
2027	4
2028	0
2029	0
2030	0
2031	0
Thereafter	0
Total lease payments	18
Less: imputed interest	0
Present value of lease liabilities	$ 18	$ 36

WARRANTY LIABILITY - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Sep. 30, 2025
Product Warranty Liability [Line Items]
Short-term warranty liability	$ 6,542	$ 5,694
Long-term warranty liability	$ 1,239	$ 1,239
Home and Building Products \| Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
Home and Building Products \| Maximum
Product Warranty Liability [Line Items]
Product warranty period	10 years
Discontinued Operations \| Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
Discontinued Operations \| Maximum
Product Warranty Liability [Line Items]
Product warranty period	10 years

SHAREHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) $ / shares in Units, $ in Thousands						1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	May 06, 2026 $ / shares	Nov. 13, 2024 USD ($)	Mar. 20, 2024 shares	Feb. 17, 2022 shares	Jan. 30, 2020 shares	May 07, 2026 USD ($) $ / shares shares	Mar. 31, 2026 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) executive $ / shares shares	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) dividend executive $ / shares shares	Mar. 31, 2025 USD ($)	Sep. 30, 2025 dividend $ / shares	Jan. 31, 2018 shares
Class of Stock [Line Items]
Number of quarterly dividends \| dividend										2		4
Dividends declared, amount per share (in dollars per share) \| $ / shares												$ 0.72
Accrued dividends \| $							$ 1,836			$ 1,836
Number of allocated shares (in shares)							3,777,638			3,777,638
Number of additional shares authorized (in shares)				1,200,000
Compensation expense \| $							$ 7,688		$ 6,182	$ 13,758	$ 11,262
Stock repurchase program, authorized amount, period income (decrease) \| $		$ 400,000
Stock repurchased during period (in shares)							422,151			668,888
Stock repurchased during period \| $							$ 32,940			$ 51,003
Shares acquired, average cost per share (in dollars per share) \| $ / shares							$ 78.03			$ 76.25
Excise tax \| $							$ 329			$ 510
Stock repurchase program, remaining authorized repurchase amount \| $							$ 247,010			$ 247,010
Shares paid for tax withholding for share based compensation (in shares)							6,304			166,160
Shares paid for tax withholding for share based compensation, value \| $							$ 515			$ 12,505
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) \| $ / shares							$ 81.77			$ 75.26
Share repurchase program, excise tax expense (reversal) for award vesting adjustment \| $							$ 30			$ 173
Subsequent Event
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares	$ 0.22
Restricted Stock Subject to Performance Conditions \| Executive And Key Employees
Class of Stock [Line Items]
Award vesting period								36 months
Restricted Stock Subject to Performance Conditions \| Senior Executives
Class of Stock [Line Items]
Number of executive officers granted shares \| executive								4		4
Award vesting period								36 months
Equity instruments other than options, grants in period (in shares)								531,456
Post-vesting holding period (in years)								2 years
Target number of shares to be vested if performance condition is attained (in shares)								177,152
Restricted Stock Subject to Performance Conditions \| Senior Executives \| Minimum
Class of Stock [Line Items]
Number of shares to be vested if performance condition is attained (in shares)								88,578
Restricted Stock Subject to Performance Conditions \| Senior Executives \| Maximum
Class of Stock [Line Items]
Number of shares to be vested if performance condition is attained (in shares)								531,456
Restricted Stock Subject to Performance Conditions \| Director
Class of Stock [Line Items]
Award vesting period							1 year
Restricted Stock Subject to Performance Conditions \| Executive Officer \| Subsequent Event
Class of Stock [Line Items]
Award vesting period						60 months
Restricted Stock and Restricted Stock Units
Class of Stock [Line Items]
Award vesting period										3 years
Equity instruments other than options, granted in period, fair value \| $								$ 14,326
Weighted average fair value (in dollars per share) \| $ / shares								$ 80.87
Restricted Stock and Restricted Stock Units, Subject To Performance Conditions \| Executive And Key Employees
Class of Stock [Line Items]
Number of executive officers granted shares \| executive								29
Equity instruments other than options, grants in period (in shares)								147,398
Equity instruments other than options, granted in period, fair value \| $								$ 9,855
Weighted average fair value (in dollars per share) \| $ / shares								$ 66.86
Restricted Stock and Restricted Stock Units, Subject To Performance Conditions \| Director
Class of Stock [Line Items]
Equity instruments other than options, grants in period (in shares)							13,400
Equity instruments other than options, granted in period, fair value \| $							$ 1,200
Weighted average fair value (in dollars per share) \| $ / shares							$ 89.52
Restricted Stock and Restricted Stock Units, Subject To Performance Conditions \| Executive Officer \| Subsequent Event
Class of Stock [Line Items]
Equity instruments other than options, grants in period (in shares)						5,401
Equity instruments other than options, granted in period, fair value \| $						$ 500
Weighted average fair value (in dollars per share) \| $ / shares						$ 92.58
Incentive Plan
Class of Stock [Line Items]
Number of shares authorized (in shares)							8,850,000			8,850,000			1,000,000
Number of additional shares authorized (in shares)			2,600,000		1,700,000
Share-based payment award, expiration period (in years)										10 years
Maximum percentage of exercise price at grant date fair value										100.00%
Number of shares available for grant (in shares)							1,316,946			1,316,946
Incentive Plan \| Incentive Stock Options
Class of Stock [Line Items]
Number of shares authorized (in shares)							600,000			600,000
O 2026 Q1 Dividends
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares										$ 0.22
O 2025 Q1 Dividends
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares												0.18
O 2025 Q2 Dividends
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares												0.18
O 2025 Q3 Dividends
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares												0.18
O 2025 Q4 Dividends
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) \| $ / shares												$ 0.18