WARRANTY LIABILITY (Tables)

6 Months Ended

Mar. 31, 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 March 31,						Six Months Ended March 31,
	2019			2018			2019			2018
Balance, beginning of period	$	9,041		$	6,055		$	8,174		$	6,236
Warranties issued and changes in estimated pre-existing warranties	4,700			1,637			8,761			3,112
Actual warranty costs incurred	(5,730		)	(1,434		)	(8,924		)	(3,926		)
Other warranty liabilities assumed from acquisitions	—			—			—			836
Balance, end of period	$	8,011		$	6,258		$	8,011		$	6,258