Stock-Based Compensation - Summary of RSUs Activity (Details) - Restricted stock units	9 Months Ended
	Jun. 30, 2024 $ / shares shares
Number of RSUs
Beginning of period (in shares) | shares	4,241,640
Granted (in shares) | shares	1,876,825
Vested (in shares) | shares	(927,766)
Forfeited (in shares) | shares	(160,775)
End of period (in shares) | shares	5,029,924
Weighted- Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 58.43
Granted (in dollars per share) | $ / shares	30.67
Vested (in dollars per share) | $ / shares	53.16
Forfeited (in dollars per share) | $ / shares	41.75
Ending balance (in dollars per share) | $ / shares	$ 49.58