WARRANTY LIABILITY (Tables)

6 Months Ended

Mar. 31, 2021

Product Warranties Disclosures [Abstract]

Summary of Changes in Warranty Liability, Included in Accrued Liabilities

Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows:

	Three Months Ended March 31,				Six Months Ended March 31,
	2021		2020		2021		2020
Balance, beginning of period	$	10,834	$	7,344	$	10,843	$	7,894
Warranties issued and changes in estimated pre-existing warranties	6,477		4,862		11,216		8,227
Actual warranty costs incurred	(4,633)		(4,417)		(9,381)		(8,332)
Balance, end of period	$	12,678	$	7,789	$	12,678	$	7,789