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GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Goodwill    
Beginning balance $ 157,825 $ 51,927
Impairment (66,367) (236,005)
Foreign exchange impact   26
Ending balance 94,286 157,825
DSA    
Goodwill    
Acquisitions 2,828 39,531
RMS    
Goodwill    
Acquisitions   302,346
Impairment   (236,005)
Accumulated impairment loss after deducting foreign exchange $ (302,220) $ (235,853)