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Stock-Based Compensation - Summary of Nonvested Stock Awards (Details)
 12 Months Ended
Sep. 30, 2024
$ / shares
shares
Restricted (Nonvested) Stock  
Weighted Average Price  
Beginning balance (in dollars per share) | $ / shares $ 64.90
Granted (in dollars per share) | $ / shares 55.05
Vested (in dollars per share) | $ / shares 63.75
Forfeited (in dollars per share) | $ / shares 61.42
Ending balance (in dollars per share) | $ / shares $ 59.29
Shares Subject to Restriction/PSU  
Beginning balance (in shares) | shares 2,807,113
Granted (in shares) | shares 2,090,092
Vested (in shares) | shares (1,315,306)
Forfeited (in shares) | shares (677,796)
Ending balance (in shares) | shares 2,904,103
Performance Shares  
Weighted Average Price  
Beginning balance (in dollars per share) | $ / shares $ 71.77
Granted (in dollars per share) | $ / shares 54.13
Vested (in dollars per share) | $ / shares 50.53
Forfeited (in dollars per share) | $ / shares 73.83
Ending balance (in dollars per share) | $ / shares $ 71.20
Shares Subject to Restriction/PSU  
Beginning balance (in shares) | shares 867,524
Granted (in shares) | shares 370,307
Vested (in shares) | shares (299,746)
Forfeited (in shares) | shares (142,452)
Ending balance (in shares) | shares 795,633