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Stock-Based Compensation - Summary of RSUs Activity (Details) - Restricted stock units
 6 Months Ended
Mar. 31, 2024
$ / shares
shares
Number of RSUs  
Beginning of period (in shares) | shares 4,241,640
Granted (in shares) | shares 1,838,025
Vested (in shares) | shares (876,352)
Forfeited (in shares) | shares (112,150)
End of period (in shares) | shares 5,091,163
Weighted- Average Grant Date Fair Value Per Share  
Beginning balance (in dollars per share) | $ / shares $ 58.43
Granted (in dollars per share) | $ / shares 30.75
Vested (in dollars per share) | $ / shares 53.60
Forfeited (in dollars per share) | $ / shares 44.16
Ending balance (in dollars per share) | $ / shares $ 49.58