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WARRANTY LIABILITY (Tables)
 3 Months Ended
Dec. 31, 2018
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,
 
 
2018
 
2017
Balance, beginning of period
 
$
8,174

 
$
6,236

Warranties issued and changes in estimated pre-existing warranties
 
4,061

 
1,475

Actual warranty costs incurred
 
(3,194
)
 
(2,492
)
Other warranty liabilities assumed from acquisitions
 
—

 
$
836

Balance, end of period
 
$
9,041

 
$
6,055