Stock-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted stock units $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Number of Units
Outstanding, beginning balance (in shares) | shares	8,308,177
Granted (in shares) | shares	5,272,828
Released (in shares) | shares	(4,458,367)
Forfeited (in shares) | shares	(1,460,603)
Outstanding, ending balance (in shares) | shares	7,662,035
Units expected to vest (in shares) | shares	6,618,791
Weighted-Average Grant Date Fair Value
Outstanding, beginning balance (in USD per share) | $ / shares	$ 19.25
Granted (in USD per share) | $ / shares	17.33
Released (in USD per share) | $ / shares	16.66
Forfeited (in USD per share) | $ / shares	19.34
Outstanding, ending balance (in USD per share) | $ / shares	19.42
Vested and expected to vest - Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 19.39
Additional Information
Aggregate Intrinsic Value, beginning balance | $	$ 115,484
Aggregate Intrinsic Value, ending balance | $	98,917
Vested and expected to vest - Weighted Average Intrinsic Value | $	$ 85,449