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WARRANTY LIABILITY (Tables)
 9 Months Ended
Jun. 30, 2024
Product Warranties Disclosures [Abstract]  
Schedule of Changes in Warranty Liability, Included in Accrued Liabilities
Changes in Griffon’s warranty liability for the three and nine months ended June 30, 2024 and 2023 were as follows:
 Three Months Ended June 30,Nine Months Ended June 30,
 2024202320242023
Balance, beginning of period$14,903 $21,341 $20,781 $18,026 
Warranties issued and changes in estimated pre-existing warranties7,716 4,999 17,760 16,079 
Actual warranty costs incurred(6,966)(3,402)(22,888)(11,167)
Balance, end of period$15,653 $22,938 $15,653 $22,938