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Equity - Schedule of Unvested RSUs and PSUs (Details) - $ / shares
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Restricted Stock Units      
Number of Share Units      
Unvested units beginning balance (in shares) 4,126,605    
Granted (in shares) 2,236,097    
Vested (in shares) 1,442,026    
Forfeited/canceled (in shares) 23,978    
Unvested units ending balance (in shares) 4,896,698 4,126,605  
Weighted-Average Grant Date Fair Value      
Unvested and outstanding beginning balance (in dollars per share) $ 36.84    
Granted (in dollars per share) 30.73 $ 35.79 $ 34.93
Vested (in dollars per share) 34.74    
Forfeited/canceled (in dollars per share) 32.79    
Unvested and outstanding ending balance (in dollars per share) $ 34.70 $ 36.84  
Performance Share Units      
Number of Share Units      
Unvested units beginning balance (in shares) 565,579    
Granted (in shares) 0    
Vested (in shares) 0    
Forfeited/canceled (in shares) 0    
Unvested units ending balance (in shares) 565,579 565,579  
Weighted-Average Grant Date Fair Value      
Unvested and outstanding beginning balance (in dollars per share) $ 51.04    
Granted (in dollars per share) 0 $ 43.49 $ 60.25
Vested (in dollars per share) 0    
Forfeited/canceled (in dollars per share) 0    
Unvested and outstanding ending balance (in dollars per share) $ 51.04 $ 51.04  
Stock Options      
Number of Share Units      
Unvested units beginning balance (in shares) 0    
Granted (in shares) 471,698    
Vested (in shares) 0    
Forfeited/canceled (in shares) 0    
Unvested units ending balance (in shares) 471,698 0  
Weighted-Average Exercise Price      
Unvested and outstanding beginning balance (in dollars per share) $ 0    
Granted (in dollars per share) 27.48    
Vested (in dollars per share) 0    
Forfeited/canceled (in dollars per share) 0    
Unvested and outstanding ending balance (in dollars per share) $ 27.48 $ 0