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Equity-Based Compensation - Summary of the Company Restricted Stock Unit Activity (Details)
6 Months Ended
Mar. 31, 2022
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Weighted Average Exercise Price, Outstanding at September 30, 2021 $ 21.55
Granted, weighted average exercise price 15.04
Forfeited, weighted average exercise price 17.55
Weighted Average Exercise Price, Outstanding at March 31, 2022 $ 19.05
Restricted Stock Units (RSUs) [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Outstanding | shares | shares 1,299,000
Granted | shares | shares 759,000,000,000
Vested | shares | shares 394,000,000,000
Forfeited | shares | shares 103,000,000,000
Ending balance, Outstanding | shares | shares 1,561,000
Weighted Average Exercise Price, Outstanding at September 30, 2021 $ 15.14
Granted, weighted average exercise price 14.94
Vested, weighted average exercise price 15.48
Forfeited, weighted average exercise price 15.02
Weighted Average Exercise Price, Outstanding at March 31, 2022 $ 15.03