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WARRANTY LIABILITY (Tables)
 3 Months Ended
Dec. 31, 2017
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 December 31,
 
2017
 
2016
Balance, beginning of period
$
6,236

 
$
6,322

Warranties issued and changes in estimated pre-existing warranties
1,475

 
1,294

Actual warranty costs incurred
(2,492
)
 
(1,601
)
Other warranty liabilities assumed from acquisitions
$
836

 
$
—

Balance, end of period
$
6,055

 
$
6,015