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Stock-based Compensation - Activity Under The Equity Incentive Plans (Details)
shares in Thousands
 6 Months Ended
Mar. 31, 2025
$ / shares
shares
Restricted Stock Unit  
Number of Shares  
Beginning balance (in shares) | shares 1,964
Granted (in shares) | shares 1,120
Vested/Issued (in shares) | shares (499)
Forfeited (in shares) | shares (170)
Ending balance (in shares) | shares 2,415
Weighted average grant date fair value per share  
Beginning balance (in usd per share) | $ / shares $ 32.13
Granted (in usd per share) | $ / shares 47.36
Vested (in usd per share) | $ / shares 39.03
Forfeited (in usd per share) | $ / shares 33.25
Ending balance (in usd per share) | $ / shares $ 37.68
Performance Stock Unit  
Number of Shares  
Beginning balance (in shares) | shares 1,167
Granted (in shares) | shares 1,354
Vested/Issued (in shares) | shares (311)
Forfeited (in shares) | shares (111)
Ending balance (in shares) | shares 2,099
Weighted average grant date fair value per share  
Beginning balance (in usd per share) | $ / shares $ 27.01
Granted (in usd per share) | $ / shares 47.75
Vested (in usd per share) | $ / shares 44.89
Forfeited (in usd per share) | $ / shares 25.27
Ending balance (in usd per share) | $ / shares $ 37.83