Stock-Based Compensation - Summary of RSUs Activity (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Sep. 30, 2023 $ / shares shares
Number of RSUs
Beginning of period (in shares) | shares	4,069,931
Granted (in shares) | shares	1,243,644
Vested (in shares) | shares	(913,146)
Forfeited (in shares) | shares	(158,789)
End of period (in shares) | shares	4,241,640
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 64.39
Granted (in dollars per share) | $ / shares	34.32
Vested (in dollars per share) | $ / shares	52.99
Forfeited (in dollars per share) | $ / shares	53.80
Ending balance (in dollars per share) | $ / shares	$ 58.43