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WARRANTY LIABILITY (Tables)
 12 Months Ended
Sep. 30, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows:
 
Years Ended September 30,
 
2018
 
2017
Balance, beginning of period
$
6,236

 
$
6,322

Warranties issued and changes in estimated pre-existing warranties
8,770

 
6,393

Actual warranty costs incurred
(7,948
)
 
(6,479
)
Other warranty liabilities assumed from acquisitions
$
1,116

 
$
—

Balance, end of period
$
8,174

 
$
6,236