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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
Total goodwill $ 309,505,000 $ 309,505,000
Goodwill, accumulated impairment 0  
Asset impairment charges $ 0 $ 0