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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 20, 2021 | Mar. 31, 2022 | Mar. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 18, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 580,542 | $ 580,542 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Unvested awards (in shares) |  |  |  | 1,422,658 | 1,775,732 | 2,500,000
Greenspring |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |  |
Cash consideration, net of working capital adjustment | $ 185,000 |  |  |  |  |
Earn-out (up to) | $ 75,000 |  |  |  |  |
Acquisition-related costs |  |  | $ 13,800 |  |  |
Weighted-average amortization period | 10 years |  |  |  |  |
Goodwill | $ 573,750 |  |  |  |  |
Revenue since acquisition date |  | $ 230,000 |  |  |  |
Earnings since acquisition date |  | $ 54,000 |  |  |  |
Greenspring | Contractual rights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets | 320,500 |  |  |  |  |
Greenspring | Client relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets | $ 96,650 |  |  |  |  |
Greenspring | Class A Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock issued for acquisition (in shares) | 12,686,756 |  |  |  |  |
Greenspring | Class C common stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock issued for acquisition (in shares) | 3,071,519 |  |  |  |  |

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