WARRANTY LIABILITY (Tables)

9 Months Ended

Jun. 30, 2019

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability

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

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Balance, beginning of period	$	8,011		$	6,258		$	8,174		$	6,236
Warranties issued and changes in estimated pre-existing warranties	3,780			2,777			12,541			5,889
Actual warranty costs incurred	(4,063		)	(1,450		)	(12,987		)	(5,376		)
Other warranty liabilities assumed from acquisitions	—			—			—			836
Balance, end of period	$	7,728		$	7,585		$	7,728		$	7,585