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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation awards granted, other than options (in shares) 363,264    
Weighted average grant date fair value (in USD per share) $ 55.12 $ 59.48 $ 109.10
Compensation costs net yet recognized $ 9.9    
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 $ 20.0