Equity-Based Compensation - Summary of Company's Performance Stock Unit Activity (Details)	12 Months Ended
	Sep. 30, 2023 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted Average Exercise Price, Outstanding at September 30, 2022	$ 19.07
Forfeited, weighted average exercise price	19.08
Weighted Average Exercise Price, Outstanding at September 30, 2023	$ 19.06
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Beginning balance, Outstanding | shares | shares	403,000
Granted | Shares | shares	838,000
Forfeited | shares | shares	729,000
Ending balance, Outstanding | shares | shares	512,000
Weighted Average Exercise Price, Outstanding at September 30, 2022	$ 12.41
Granted, weighted average exercise price	7.48
Forfeited, weighted average exercise price	10.2
Weighted Average Exercise Price, Outstanding at September 30, 2023	$ 7.48