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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Alternative assets | $ 211,324 | $ 259,113
Debt securities available-for-sale | 1,777 | 1,687
Other equity securities and interests | 26,500 | 26,500
Customer ExAlt Trusts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Alternative assets | 211,324 | 259,113
Public equity securities | 4,376 | 4,065
Debt securities available-for-sale | 1,777 | 1,687
Other equity securities and interests | 26,501 | 26,506
Total investments, at fair value | $ 243,978 | $ 291,371

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