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Equity-Based Compensation - Summary of Stock Options Activity (Details)
12 Months Ended
Sep. 30, 2022
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Outstanding at September 30, 2021 | shares 7,017,000
Granted | shares 783,000
Exercised | shares 1,000
Forfeited | shares 310,000
Outstanding at September 30, 2022 | shares 7,489,000
Vested and exercisable at September 30, 2022 | shares 4,284,000
Expected to vest after September 30, 2022 | shares 3,205,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted Average Exercise Price, Outstanding at September 30, 2021 | $ / shares $ 21.55
Granted, weighted average exercise price | $ / shares 15.04
Exercised, Weighted Average Exercise Price | $ / shares 13.49
Forfeited, weighted average exercise price | $ / shares 18.04
Weighted Average Exercise Price, Outstanding at September 30, 2022 | $ / shares 19.07
Weighted Average Exercise Price, Vested and Exercisable at September 30, 2022 | $ / shares 20.12
Weighted Average Exercise Price, Expected to vest after September 30, 2022 | $ / shares $ 17.67