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EQUITY - Restricted Share-Based Awards, Additional Information (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 13, 2025
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)   $ 70.39 $ 55.12 $ 59.48
Compensation costs net yet recognized   $ 7.1    
Expected weighted average period for unrecognized compensation cost (in years)   1 year 4 months 24 days    
Total fair value of share-based payment awards vested   $ 53.1 $ 4.6 $ 11.2
Share-based compensation awards granted, other than options (in shares)   392,164    
Subsequent Event        
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]        
Share-based compensation awards granted, other than options (in shares) 300,000