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v3.23.1

Equity-Based Compensation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) shares | Mar. 31, 2022 USD ($)
Performance Shares | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of final number of of common stock issuable upon vesting of performance stock units |  |  | 0 |
Performance Shares | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of final number of of common stock issuable upon vesting of performance stock units |  |  | 1.50 |
Percentage increase (decrease) of awards granted due to total shareholder return ranking |  |  | 0.15 |
Class A Common Stock | Restricted Stock | Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted (in shares) | shares |  |  | 180,798 |
Compensation expense | $ 2.2 | $ 1.8 | $ 4.2 | $ 3.2
Unrecognized compensation expense | 14.1 |  | 14.1 |
Class A Common Stock | Performance Shares | Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 0.5 | $ 0.0 | 1.0 | $ 0.0
Unrecognized compensation expense | $ 3.1 |  | $ 3.1 |

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