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LONG-TERM DEBT - Narrative (Details)
$ in Thousands, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 26, 2024
USD ($)
Nov. 30, 2012
CAD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
AUD ($)
Jan. 31, 2025
CAD ($)
Sep. 30, 2024
USD ($)
Jun. 25, 2024
Sep. 30, 2023
AUD ($)
Aug. 01, 2023
USD ($)
Jul. 31, 2023
USD ($)
Jan. 24, 2022
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]                            
Capitalized Fees & Expenses     $ 13,243,000         $ 15,203,000            
Debt outstanding     1,550,599,000         1,539,685,000            
Revolver due 2028                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity                     $ 500,000,000 $ 400,000,000    
Line of credit facility, incremental minimum borrowing amount                     500,000,000 375,000,000    
Outstanding standby letters of credit     12,990,000                      
Remaining borrowing capacity     $ 364,510,000                      
Revolver due 2028 | Letter of Credit Subfacility                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity                     125,000,000 $ 100,000,000    
Revolver due 2028 | Multicurrency Subfacility                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity                     $ 200,000,000      
Revolver Due 2025, SOFR Loan                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, effective percentage     6.17%   6.17% 6.17%                
Revolver Due 2025, SOFR Loan | Secured Overnight Financing Rate (SOFR)                            
Debt Instrument [Line Items]                            
Basis spread on variable rate     1.75%                      
Revolver Due 2025, Base Rate Loan                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, effective percentage     8.25%   8.25% 8.25%                
Revolver Due 2025, Base Rate Loan | Base Rate                            
Debt Instrument [Line Items]                            
Basis spread on variable rate     0.75%                      
Receivables Purchase Facility | Griffon Australia                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, effective percentage     5.35%   5.35% 5.35%                
Maximum borrowing capacity     $ 18,918,000     $ 30,000       $ 15,000        
Long-term line of credit     $ 0                      
Receivables Purchase Facility | Bank Bill Swap Rate | Griffon Australia                            
Debt Instrument [Line Items]                            
Basis spread on variable rate     1.25%                      
Senior Notes | Senior notes due 2022                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, stated percentage                           5.25%
Senior Notes | Senior notes due 2028                            
Debt Instrument [Line Items]                            
Face amount                           $ 1,000,000,000
Debt instrument, interest rate, stated percentage                           5.75%
Capitalized Fees & Expenses                           $ 16,448,000
Repurchased face amount       $ 25,225,000,000                    
Weighted average discount       91.82%                    
Repurchase amount       $ 23,161,000,000                    
Debt issuance fees and expenses, net     $ 5,890,000                      
Senior Notes | Fair Value, Inputs, Level 1 | Senior notes due 2028                            
Debt Instrument [Line Items]                            
Long-term debt, fair value     950,406,000                      
Term Loan | Term Loan B due 2029                            
Debt Instrument [Line Items]                            
Face amount                         $ 800,000,000  
Repayments of debt       $ 325,000,000                    
Debt issuance fees and expenses, net     $ 4,795,000                      
Debt instrument, issuance price (in percentage)                         99.75%  
SOFR floor 0.00%               0.50%          
Debt instrument, charges for debt amendment $ 1,700,000                          
Debt instrument, interest rate, effective percentage     6.32%   6.32% 6.32%                
Principal payments $ 2,000,000                          
Term Loan | Term Loan B due 2029 | Secured Overnight Financing Rate (SOFR)                            
Debt Instrument [Line Items]                            
Margin above SOFR, period increase (decrease) (0.25%)                          
Basis spread on variable rate 2.00%                          
Term Loan B due 2029                            
Debt Instrument [Line Items]                            
Capitalized Fees & Expenses     $ 4,795,000         5,420,000            
Debt outstanding     453,000,000         $ 457,000,000            
Term Loan B due 2029 | Fair Value, Inputs, Level 1                            
Debt Instrument [Line Items]                            
Long-term debt, fair value     453,000,000                      
Non US lines of credit                            
Debt Instrument [Line Items]                            
Basis spread on variable rate   1.20%                        
Maximum borrowing capacity   $ 15,000 13,992,000   $ 20,000   $ 20,000              
Long-term line of credit     $ 0                      
Non US lines of credit | Canada Dollar Offer Rate                            
Debt Instrument [Line Items]                            
Interest rate at period end     4.27%   4.27% 4.27%