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EQUITY - Performance-Based Awards, Additional Information (Details) - Performance-Based Units - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
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) $ 71.35 $ 74.57 $ 66.00
Compensation costs net yet recognized $ 6.7    
Total fair value of share-based payment awards vested   $ 10.6 $ 17.4
Expected weighted average period for unrecognized compensation cost (in years) 1 year 10 months 24 days    
Award vesting period (in years) 3 years    
Share-based compensation awards granted, other than options (in shares) 147,787    
Liability awards accrued $ 20.2    
Cost not yet recognized $ 0.0