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LONG-TERM DEBT - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Jun. 26, 2024 USD ($) | Jun. 24, 2024 USD ($) | Jul. 31, 2018 USD ($) | Jul. 31, 2018 GBP (£) | Nov. 30, 2012 CAD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2025 CAD ($) | Sep. 30, 2025 AUD ($) | Sep. 30, 2024 AUD ($) | Jun. 25, 2024 | Sep. 28, 2023 USD ($) | Aug. 01, 2023 USD ($) | Jul. 31, 2023 USD ($) | Jan. 24, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements for 2026 |  |  |  |  |  | $ 8,103,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements for 2027 |  |  |  |  |  | 8,045,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements for 2028 |  |  |  |  |  | 982,819,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements for 2029 |  |  |  |  |  | 425,047,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements for 2030 |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum payments under debt agreements thereafter |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Capitalized fees & expenses |  |  |  |  |  | 11,196,000 | $ 15,203,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | 1,424,026,000 | 1,539,685,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from debt extinguishment |  |  |  |  |  | 0 | (1,700,000) | $ (437,000) |  |  |  |  |  |  |  |  |  |
Revolver due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 400,000,000 |
Letters of credit outstanding, amount |  |  |  |  |  | 14,328,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | $ 485,672,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolver Due 2025, SOFR Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  |  |  |  | 5.98% |  |  |  |  | 5.98% | 5.98% |  |  |  |  |  |
Revolver Due 2025, SONIA Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  |  |  |  | 5.75% |  |  |  |  | 5.75% | 5.75% |  |  |  |  |  |
Revolver Due 2025, Base Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  |  |  |  | 8.00% |  |  |  |  | 8.00% | 8.00% |  |  |  |  |  |
Term Loan | Ames UK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  | £ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Ames UK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Letter of Credit Subfacility | Revolver due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Multicurrency Subfacility | Revolver due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Receivables Purchase Facility | Griffon Australia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |
Debt instrument, interest rate at period end |  |  |  |  |  | 4.79% |  |  |  |  | 4.79% | 4.79% |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 | $ 30,000,000 |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | $ 19,707,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Stated percentage |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |
Capitalized fees & expenses |  |  |  |  |  |  |  |  |  | $ 16,448,000 |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  |  |  |  |  |  | $ 25,225,000 |  |  |  |  |  |  |  |  |
Repurchase of debt instrument, discount rate |  |  |  |  |  |  |  |  | 91.82% |  |  |  |  |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  |  |  |  | $ 23,161,000 |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  | 4,880,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes due 2028 | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  | 972,338,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Term Loan B due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Stated percentage |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |
Revolver due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized fees & expenses |  |  |  |  |  | 2,113,000 | 2,859,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | 0 | 107,500,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan B due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized fees & expenses |  |  |  |  |  |  | 5,420,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | 449,000,000 | $ 457,000,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan B due 2029 | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  | 450,684,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Ames UK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 9,543,000 | 7,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan B due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000
Repayments of debt |  |  |  |  |  |  |  | 325,000,000 | 325,000,000 |  |  |  |  |  |  |  |  |
Capitalized fees & expenses |  |  |  |  |  | $ 4,169,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance price, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.75%
Gain (loss) from debt extinguishment |  |  |  |  |  |  |  | (437,000) | (6,296,000) |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost, underwriting and other fees |  |  |  |  |  |  |  | 386,000 | 5,575,000 |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost, original issuer discount |  |  |  |  |  |  |  | $ 51,000 | $ 721,000 |  |  |  |  |  |  |  |  |
S0FR floor rate | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |
Debt instrument, charges for debt amendment | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  |  |  |  | 6.13% |  |  |  |  | 6.13% | 6.13% |  |  |  |  |  |
Debt instrument, periodic payment, principal |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non U.S. lines of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | $ 14,376,000 |  |  |  |  | $ 20,000 |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages | Ames UK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 3,108,000 | £ 2,451,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate | Revolver Due 2025, SOFR Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate | Term Loan | Term Loan B due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate, period increase (decrease) | (0.25%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base Rate | Revolver Due 2025, Base Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Canada Dollar Offer Rate | Non U.S. lines of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  |  |  | 4.06% |  |  |  |  | 4.06% | 4.06% |  |  |  |  |  |
Bank Bill Swap Bid Rate | Receivables Purchase Facility | Griffon Australia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Sterling Overnight Index Average | Revolver Due 2025, SONIA Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Ocala, Florida | Finance lease - real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire leased property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,207,000 |  |  |
Long-term debt, percentage bearing fixed interest, percentage rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.60% |  |  |

X
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