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Equity-Based Compensation - Summary of the Company Restricted Stock Unit Activity (Details)
3 Months Ended
Dec. 31, 2021
$ / 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 17.60
Weighted Average Exercise Price, Outstanding at December 31, 2021 $ 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 714,000
Vested | shares | shares 359,000
Forfeited | shares | shares 54,000
Ending balance, Outstanding | shares | shares 1,600,000
Weighted Average Exercise Price, Outstanding at September 30, 2021 $ 15.14
Granted, weighted average exercise price 15.04
Vested, weighted average exercise price 15.42
Forfeited, weighted average exercise price 15.17
Weighted Average Exercise Price, Outstanding at December 31, 2021 $ 15.03