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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]      
Total goodwill $ 309,505,000 $ 309,505,000 $ 309,505,000
Goodwill, accumulated impairment 0    
Asset impairment charges $ 0 $ 0