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Investments - Consolidated Funds Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Net realized gains on investments | $ 2,325 | $ 3 | $ 0
Net unrealized gains on investments | $ 26,147 | $ 9,312 | $ 0

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