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EQUITY - Restricted Shares Issued to Vendor (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation awards granted, other than options (in shares) 392,164    
Weighted average grant date fair value (in USD per share) $ 70.39 $ 55.12 $ 59.48
Compensation costs net yet recognized $ 7.1    
Vendor      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation awards granted, other than options (in shares)   300,000 800,000
Weighted average grant date fair value (in USD per share)   $ 69.88 $ 52.44
Compensation costs net yet recognized $ 0.0