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WARRANTY LIABILITY (Tables)
12 Months Ended
Sep. 30, 2025
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows:
 Years Ended September 30,
 20252024
Balance, beginning of period$13,050 $20,781 
Warranties issued and changes in estimated pre-existing warranties19,300 23,253 
Actual warranty costs incurred(22,207)(30,984)
Balance, end of period$10,143 $13,050