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Intangibles and Goodwill - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 20, 2021 | Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |
Amortization of intangible assets | $ 1,900,000 | $ 800,000 | $ 2,500,000 | $ 1,700,000 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | 582,973,000 |  | 582,973,000 |  |  | $ 6,792,000
Goodwill, impairment loss | $ 0 |  | $ 0 |  |  | $ 0
Greenspring |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 576,181,000 |
Management contracts | Greenspring |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business acquisition, finite-lived intangible assets |  |  |  |  | 310,900,000 |
Client relationships | Greenspring |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business acquisition, finite-lived intangible assets |  |  |  |  | 96,650,000 |
Service agreements | Greenspring |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business acquisition, finite-lived intangible assets |  |  |  |  | $ 9,500,000 |

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