Equity-Based Compensation (Details) - Class A Common Stock - Restricted Stock - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2021 |
Dec. 31, 2019 |
Mar. 31, 2021 |
Sep. 30, 2019 |
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| Non-Employee Directors Under the Equity Incentive Plan | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Options granted (in shares) | 292,534 | |||
| Aggregate grant date fair value | $ 3.8 | |||
| Compensation expense | $ 0.3 | $ 0.7 | ||
| Unrecognized compensation expense | $ 1.0 | 1.0 | ||
| Equity Incentive Plan | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Options granted (in shares) | 510,733 | |||
| Aggregate grant date fair value | $ 13.6 | 13.6 | ||
| Compensation expense | 0.2 | |||
| Unrecognized compensation expense | $ 13.4 | $ 13.4 | ||
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award Aggregate Grant Date Fair Value No definition available.
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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