WARRANTY LIABILITY (Tables)

12 Months Ended

Sep. 30, 2019

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,
	2019			2018
Balance, beginning of period	$	8,174		$	6,236
Warranties issued and changes in estimated pre-existing warranties	16,938			8,770
Actual warranty costs incurred	(17,218		)	(7,948		)
Other warranty liabilities assumed from acquisitions	$	—		$	1,116
Balance, end of period	$	7,894		$	8,174