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EQUITY - Restricted Share-Based Awards, Additional Information (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Weighted average grant date fair value (in USD per share) $ 59.48 $ 109.10 $ 230.95
Compensation costs net yet recognized $ 16.5    
Expected weighted average period for unrecognized compensation cost (in years) 1 year 6 months    
Total fair value of share-based payment awards vested $ 11.2 $ 28.2 $ 41.8