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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	$ 231,586	$ 259,113
Debt securities available-for-sale	1,687	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	231,586	259,113
Public equity securities	3,995	4,065
Debt securities available-for-sale	1,687	1,687
Other equity securities and interests	26,501	26,506
Total investments, at fair value	$ 263,769	$ 291,371

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