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Equity-Based Compensation - Fair Value of Stock Option Awards (Details) - Stock options
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 54.90% 55.70%
Expected dividend yield 0.00% 0.00%
Expected term 6 years 6 years
Risk-free interest rate 3.90% 1.60%