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Stock-Based Compensation - Restricted Stock Units Activity (Details) - $ / shares
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Time Vested Restricted Stock Units      
Stock Units (in thousands)      
Nonvested, Beginning Balance (in shares) 1,918,000    
Granted (in shares) 1,595,839    
Distributed (in shares) (1,103,500)    
Forfeited, canceled or expired (in shares) (354,900)    
Nonvested, Ending Balance (in shares) 2,055,400 1,918,000  
Expected to vest (in shares) 1,994,900    
Weighted Average Grant Date Fair Value      
Nonvested, Beginning Balance (in dollars per share) $ 21.34    
Granted (in dollars per share) 18.53 $ 17.39 $ 31.00
Distributed (in dollars per share) 22.47    
Forfeited, canceled or expired (in dollars per share) 18.84    
Nonvested, Ending Balance (in dollars per share) 18.97 $ 21.34  
Expected to vest (in dollars per share) $ 19.02    
Performance Based Restricted Stock Units      
Stock Units (in thousands)      
Nonvested, Beginning Balance (in shares) 56,700    
Granted (in shares) 269,900    
Distributed (in shares) (47,600)    
Forfeited, canceled or expired (in shares) (6,200)    
Nonvested, Ending Balance (in shares) 272,800 56,700  
Expected to vest (in shares) 271,800    
Weighted Average Grant Date Fair Value      
Nonvested, Beginning Balance (in dollars per share) $ 30.24    
Granted (in dollars per share) 18.17 $ 0 $ 30.24
Distributed (in dollars per share) 18.76    
Forfeited, canceled or expired (in dollars per share) 18.96    
Nonvested, Ending Balance (in dollars per share) 22.63 $ 30.24  
Expected to vest (in dollars per share) $ 22.64    
Payout adjustment (in shares) 53,800