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WARRANTY LIABILITY (Tables)
 6 Months Ended
Mar. 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 March 31,
 
Six Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
Balance, beginning of period
$
6,055

 
$
6,015

 
$
6,236

 
$
6,322

Warranties issued and changes in estimated pre-existing warranties
1,637

 
1,213

 
3,112

 
2,507

Actual warranty costs incurred
(1,434
)
 
(1,425
)
 
(3,926
)
 
(3,026
)
Other warranty liabilities assumed from acquisitions
—

 
—

 
836

 
$
—

Balance, end of period
$
6,258

 
$
5,803

 
$
6,258

 
$
5,803