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GOODWILL AND INTANGIBLE ASSETS - Summary of Changes in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Goodwill [Roll Forward]    
Balance $ 45,653 $ 82,786
Additions 0 1,200
Impairment   (38,333)
Balance $ 45,653 $ 45,653