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WARRANTY LIABILITY
 12 Months Ended
Sep. 30, 2025
Product Warranties Disclosures [Abstract]  
WARRANTY LIABILITY WARRANTY LIABILITY
CPP and HBP offer warranties against product defects for periods generally ranging from one to ten years, with limited lifetime warranties on certain door models. Typical warranties require CPP and HBP to repair or replace the defective products during the warranty period at no cost to the customer. At the time revenue is recognized, Griffon records a liability for warranty costs, estimated based on historical experience, and periodically assesses its warranty obligations and adjusts the liability as necessary. CPP offers an express limited warranty for a period of ninety days on all products from the date of the original purchase unless otherwise stated on the product or packaging from the date of original purchase. CPP provides limited lifetime warranties on certain products. Warranty costs expected to be incurred in the next 12 months are classified in accrued liabilities. Warranty costs expected to be incurred beyond one year are classified in other long-term liabilities. The short-term warranty liability was $10,143 as of September 30, 2025 and $13,050 as of September 30, 2024. The long-term warranty liability was $1,239 at both September 30, 2025 and 2024.

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