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WARRANTY LIABILITY (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 
Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Balance, beginning of period
$
5,803

 
$
6,469

 
$
6,322

 
$
6,040

Warranties issued and changes in estimated pre-existing warranties
803

 
1,496

 
3,310

 
4,504

Actual warranty costs incurred
(1,457
)
 
(1,698
)
 
(4,483
)
 
(4,277
)
Balance, end of period
$
5,149

 
$
6,267

 
$
5,149

 
$
6,267