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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net periodic (benefits) costs were as follows:
 Defined Benefits for the Years Ended 
September 30,		Supplemental Benefits for the Years 
Ended September 30,
 202520242023202520242023
Net periodic (benefits) costs:      
Interest cost$5,506 $7,050 $6,814 $387 $504 $488 
Expected return on plan assets(9,387)(10,172)(10,213)— — — 
Pension termination settlement
(4,621)— — — — — 
Amortization of:      
Actuarial loss2,087 2,250 3,314 617 505 463 
Total net periodic (benefits) costs$(6,415)$(872)$(85)$1,004 $1,009 $951 
Schedule of Assumptions Used The weighted-average assumptions used in determining the net periodic (benefits) costs were as follows:
 Defined Benefits for the Years Ended 
September 30,		Supplemental Benefits for the Years 
Ended September 30,
 202520242023202520242023
Discount rate4.76 %5.63 %5.17 %4.46 %5.53 %5.02 %
Expected return on assets6.75 %6.75 %6.72 %— %— %— %
Schedule of Plan Assets and Benefit Obligation of Defined Benefit Plan
Plan assets and benefit obligation of the defined and supplemental benefit plans were as follows:
 Defined Benefits at
September 30,		Supplemental Benefits at
September 30,
 2025202420252024
Change in benefit obligation:    
Benefit obligation at beginning of fiscal year$145,746 $139,224 $10,776 $10,882 
Interest cost5,506 7,050 387 504 
Benefits paid(11,124)(11,576)(1,893)(1,896)
Benefits paid related to pension termination
(15,784)— — — 
Actuarial (gain) loss(2,823)11,048 870 1,286 
Benefit obligation at end of fiscal year121,521 145,746 10,140 10,776 
Change in plan assets:    
Fair value of plan assets at beginning of fiscal year158,705 146,997 — — 
Actual return on plan assets6,048 21,933 — — 
Company contributions631 1,351 1,893 1,896 
Benefits paid(11,124)(11,576)(1,893)(1,896)
Benefits paid related to pension termination
(15,784)— — — 
Return of excess plan assets
(6,100)— — 
Fair value of plan assets at end of fiscal year132,376 158,705 — — 
Projected benefit obligation in excess of plan assets$10,855 $12,959 $(10,140)$(10,776)
Amounts recognized in the statement of financial position consist of:    
Non-Current Assets$10,855 $12,959 $— $— 
Accrued liabilities— — (1,813)(1,823)
Other liabilities (long-term)— — (8,327)(8,953)
Total Liabilities10,855 12,959 (10,140)(10,776)
Net actuarial losses28,367 25,314 6,953 6,700 
Deferred taxes(5,957)(5,316)(1,665)(3,037)
Total accumulated other comprehensive loss, net of tax
22,410 19,998 5,288 3,663 
Net amount recognized at September 30,$33,265 $32,957 $(4,852)$(7,113)
Accumulated benefit obligations$121,521 $145,746 $10,140 $10,776 
Information for plans with accumulated benefit obligations in excess of plan assets:    
ABO$121,521 $145,746 $10,140 $10,776 
PBO121,521 145,746 10,140 10,776 
Fair value of plan assets132,376 158,705 — — 
Schedule of Weighted Average Assumptions Used in Defined and Supplemental Benefit Obligations
The weighted-average assumptions used in determining the benefit obligations were as follows:
 Defined Benefits at 
September 30,		Supplemental Benefits at 
September 30,
 2025202420252024
Weighted average discount rate5.09 %4.76 %4.52 %4.46 %
Schedule of Expected Benefit Payments
Estimated future benefit payments to retirees, which reflect expected future service, are as follows:
For the years ending September 30,Defined
Benefits		Supplemental Benefits
2026$10,929 $1,813 
202710,869 1,637 
202810,772 1,461 
202910,655 1,287 
203010,470 1,118 
2031-2035
48,453 3,453 
Schedule of Actual and Weighted Average Assets Allocation for Qualified Benefit Plans
The actual and weighted-average asset allocation for qualified benefit plans were as follows:
 At September 30, 
 20252024Target
Cash and equivalents2.4 %2.9 %— %
Equity securities5.4 %26.4 %5.0 %
Fixed income80.0 %48.6 %85.0 %
Other12.2 %22.1 %10.0 %
Total100.0 %100.0 %100.0 %
Schedule of Fair Value of Pension and Postretirement Plan Assets by Asset Category
The following table presents the fair values of Griffon’s pension and post-retirement plan assets by asset category:
At September 30, 2025Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$3,167 $— $— $3,167 
Government agency securities10,091 8,154 — 18,245 
Debt instruments75,344 9,284 — 84,628 
Equity securities7,134 — — 7,134 
Commingled funds— — 6,585 6,585 
Limited partnerships and hedge fund investments— 9,404 — 9,404 
Other securities
2,205 — — 2,205 
Subtotal$97,941 $26,842 $6,585 $131,368 
Accrued income and plan receivables1,008 
Total$132,376 
    
At September 30, 2024Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$4,522 $— $— $4,522 
Government and agency securities 5,890 5,116 — 11,006 
Debt instruments42,705 6,144 — 48,849 
Equity securities41,786 — — 41,786 
Commingled funds— 4,859 9,979 14,838 
Limited partnerships and hedge fund investments— 20,177 — 20,177 
Other securities
17,004 — — 17,004 
Subtotal$111,907 $36,296 $9,979 $158,182 
Accrued income and plan receivables523 
Total$158,705 
The following table represents Level 3 significant unobservable inputs for the years ended September 30, 2025 and 2024:
Significant
Unobservable
Inputs
(Level 3)
As of October 1, 2023
10,459 
Purchases, issuances and settlements(1,591)
Gains and losses1,111 
As of September 30, 2024$9,979 
Purchases, issuances and settlements(5,448)
Gains and losses2,054 
As of September 30, 2025
$6,585 
Employee Stock Ownership Plan (ESOP) Disclosures The ESOP shares were as follows:
 At September 30,
 20252024
Allocated shares3,977,753 4,234,713 
Unallocated shares— 17,852 
Total3,977,753 4,252,565