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Equity-Based Compensation - Schedule of Equity-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense $ 27,878 $ 26,230 $ 20,860
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense 24,276 25,163 20,860
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense $ 3,602 $ 1,067 $ 0