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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 31, 2021
Sep. 30, 2020
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Income tax (expense) benefits related to equity-based compensation $ 27 $ 205      
Granted, weighted average grant date fair value (in USD per share) $ 12.14        
Options exercisable at end of period (shares) 3,339,373        
Unrecognized compensation expense related to unvested options at end of period $ 45,867        
Period for recognition of unrecognized compensation cost 2 years        
Fair value of stock options that vested $ 4,941        
2018 Equity Incentive Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant under the plan (shares) 262,692       3,500,000
Additional Class A common shares added at the beginning of calendar year as percentage of common stock outstanding at end of previous year (percent)         4.00%
2020 Equity Incentive Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant under the plan (shares) 892,072   3,000,000 1,500,000