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WARRANTY LIABILITY (Tables)
 9 Months Ended
Jun. 30, 2026
Product Warranties Disclosures [Abstract]  
Schedule of Changes in Warranty Liability
Changes in Griffon’s warranty liability, included in Accrued liabilities, for the three and nine months ended June 30, 2026 and 2025 were as follows:
Three Months Ended June 30,Nine Months Ended June 30,
2026202520262025
Balance, beginning of period$6,542 $6,016 $5,694 $5,524 
Warranties issued and changes in estimated pre-existing warranties3,345 2,658 10,237 9,134 
Actual warranty costs incurred(2,643)(2,984)(8,687)(8,968)
Balance, end of period$7,244 $5,690 $7,244 $5,690