Equity-Based Compensation - Summary of Company's Restricted Stock Unit Activity (Details)	6 Months Ended
	Mar. 31, 2024 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted Average Exercise Price, Outstanding at September 30, 2023	$ 19.06
Forfeited, weighted average exercise price	19.29
Weighted Average Exercise Price, Outstanding at March 31, 2024	$ 19.03
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Outstanding | shares | shares	3,021,000
Granted | shares | shares	2,331,000
Vested | shares | shares	1,150,000
Forfeited | shares | shares	348,000
Ending balance, Outstanding | shares | shares	3,854,000
Weighted Average Exercise Price, Outstanding at September 30, 2023	$ 9.32
Granted, weighted average exercise price	7.58
Vested, weighted average exercise price	9.86
Forfeited, weighted average exercise price	9.12
Weighted Average Exercise Price, Outstanding at March 31, 2024	$ 8.13