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GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Goodwill    
Beginning balance $ 94,286 $ 157,825
Impairment 0 (66,367)
Ending balance 94,286 94,286
DSA    
Goodwill    
Acquisitions $ 0 2,828
RMS    
Goodwill    
Accumulated impairment loss after deducting foreign exchange   $ (302,220)