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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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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,
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
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 loss | 2,087 |  |  | 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,
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
Discount rate | 4.76 | % |  | 5.63 | % |  | 5.17 | % |  | 4.46 | % |  | 5.53 | % |  | 5.02 | %
Expected return on assets | 6.75 | % |  | 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, |  |  |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of fiscal year | $ | 145,746 |  |  | $ | 139,224 |  |  | $ | 10,776 |  |  | $ | 10,882 |  |  |  |  |
Interest cost | 5,506 |  |  | 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 year | 121,521 |  |  | 145,746 |  |  | 10,140 |  |  | 10,776 |  |  |  |  |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of fiscal year | 158,705 |  |  | 146,997 |  |  | — |  |  | — |  |  |  |  |
Actual return on plan assets | 6,048 |  |  | 21,933 |  |  | — |  |  | — |  |  |  |  |
Company contributions | 631 |  |  | 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 year | 132,376 |  |  | 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 Liabilities | 10,855 |  |  | 12,959 |  |  | (10,140) |  |  | (10,776) |  |  |  |  |
Net actuarial losses | 28,367 |  |  | 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 |  |  |  |  |
PBO | 121,521 |  |  | 145,746 |  |  | 10,140 |  |  | 10,776 |  |  |  |  |
Fair value of plan assets | 132,376 |  |  | 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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Weighted average discount rate | 5.09 | % |  | 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 |
2027 | 10,869 |  |  | 1,637 |
2028 | 10,772 |  |  | 1,461 |
2029 | 10,655 |  |  | 1,287 |
2030 | 10,470 |  |  | 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, |  |
| 2025 |  | 2024 |  | Target
Cash and equivalents | 2.4 | % |  | 2.9 | % |  | — | %
Equity securities | 5.4 | % |  | 26.4 | % |  | 5.0 | %
Fixed income | 80.0 | % |  | 48.6 | % |  | 85.0 | %
Other | 12.2 | % |  | 22.1 | % |  | 10.0 | %
Total | 100.0 | % |  | 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, 2025 | Quoted 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 securities | 10,091 |  |  | 8,154 |  |  | — |  |  | 18,245 |
Debt instruments | 75,344 |  |  | 9,284 |  |  | — |  |  | 84,628 |
Equity securities | 7,134 |  |  | — |  |  | — |  |  | 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 receivables |  |  |  |  |  |  | 1,008 |
Total |  |  |  |  |  |  | $ | 132,376 |
At September 30, 2024 | Quoted 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 instruments | 42,705 |  |  | 6,144 |  |  | — |  |  | 48,849 |
Equity securities | 41,786 |  |  | — |  |  | — |  |  | 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 receivables |  |  |  |  |  |  | 523 |
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 losses | 1,111 |
As of September 30, 2024 | $ | 9,979 |
Purchases, issuances and settlements | (5,448) |
Gains and losses | 2,054 |
As of September 30, 2025 | $ | 6,585 |
Employee Stock Ownership Plan (ESOP) Disclosures | The ESOP shares were as follows:
| At September 30,
| 2025 |  | 2024
Allocated shares | 3,977,753 |  |  | 4,234,713 |
Unallocated shares | — |  |  | 17,852 |
Total | 3,977,753 |  |  | 4,252,565 |

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