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ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications - USD ($)
$ in Thousands
Oct. 02, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Goodwill   $ 442,643 $ 437,067 $ 439,395
ClosetMaid LLC        
Business Acquisition [Line Items]        
Goodwill $ 70,159      
Indefinite-lived intangibles 47,740      
Definite-lived intangibles 26,840      
Total goodwill and intangible assets $ 144,739      
Amortization period (years) 21 years