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Equity-Based Compensation - Summary of Stock Options Activity (Details)
12 Months Ended
Sep. 30, 2021
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at October 1, 2020 | shares 6,711,000
Granted | shares 687,000
Exercised | shares 26,000
Forfeited | shares 355,000
Outstanding at September 30, 2021 | shares 7,017,000
Vested and exercisable at September 30, 2021 | shares 3,432,000
Expected to vest after September 30, 2021 | shares 3,585,000
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]  
Weighted Average Exercise Price, Outstanding at October 1, 2020 | $ / shares $ 20.08
Granted, weighted average exercise price | $ / shares 13.78
Exercised, Weighted Average Exercise Price | $ / shares 13.98
Forfeited, weighted average exercise price | $ / shares 20.84
Weighted Average Exercise Price, Outstanding at September 30, 2021 | $ / shares 21.55
Weighted Average Exercise Price, Vested and Exercisable at September 30, 2021 | $ / shares 20.81
Weighted Average Exercise Price, Expected to vest after September 30, 2021 | $ / shares $ 22.42