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WARRANTY LIABILITY (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 
Nine Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Balance, beginning of period
$
6,258

 
$
5,803

 
$
6,236

 
$
6,322

Warranties issued and changes in estimated pre-existing warranties
2,777

 
803

 
5,889

 
3,310

Actual warranty costs incurred
(1,450
)
 
(1,457
)
 
(5,376
)
 
(4,483
)
Other warranty liabilities assumed from acquisitions
—

 
—

 
836

 
$
—

Balance, end of period
$
7,585

 
$
5,149

 
$
7,585

 
$
5,149