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WARRANTY LIABILITY
 6 Months Ended
Mar. 31, 2026
Product Warranties Disclosures [Abstract]  
WARRANTY LIABILITY WARRANTY LIABILITY
 
The Company offers warranties against product defects for periods generally ranging from one to ten years, with limited lifetime warranties on certain door and fan models. Typical warranties require the Company 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. 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 $6,542 as of March 31, 2026 and $5,694 as of September 30, 2025. The long-term warranty liability was $1,239 at both March 31, 2026 and September 30, 2025.

Changes in Griffon’s warranty liability, included in Accrued liabilities, for the three and six months ended March 31, 2026 and 2025 were as follows:
 Three Months Ended March 31,Six Months Ended March 31,
 2026202520262025
Balance, beginning of period$6,150 $5,519 $5,694 $5,524 
Warranties issued and changes in estimated pre-existing warranties4,255 3,352 6,892 6,476 
Actual warranty costs incurred(3,863)(2,855)(6,044)(5,984)
Balance, end of period$6,542 $6,016 $6,542 $6,016