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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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