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Equity-Based Compensation - Summary of Company's Restricted Stock Unit Activity (Details)
9 Months Ended
Jun. 30, 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 18.09
Weighted Average Exercise Price, Outstanding at June 30, 2022 $ 19.06
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 955,000
Vested | shares | shares 428,000
Forfeited | shares | shares 165,000
Ending balance, Outstanding | shares | shares 1,661,000
Weighted Average Exercise Price, Outstanding at September 30, 2021 $ 15.14
Granted, weighted average exercise price 14.57
Vested, weighted average exercise price 15.31
Forfeited, weighted average exercise price 15.41
Weighted Average Exercise Price, Outstanding at June 30, 2022 $ 14.76