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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	$ 301,058	$ 293,916
Debt securities available-for-sale	1,849	2,962
Other equity securities and interests	26,900	26,800
Ben
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	0	0
Public equity securities and option	0	0
Debt securities available-for-sale	0	0
Other equity securities and interests	0	6
Total investments, at fair value	0	6
Customer ExAlt Trusts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	301,058	293,916
Public equity securities and option	4,466	4,897
Debt securities available-for-sale	1,849	2,962
Other equity securities and interests	26,905	27,338
Total investments, at fair value	$ 334,278	$ 329,113

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