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Investments, at Fair Value - Alternative Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 211,324	$ 259,113
Unfunded Commitments	37,022	41,644
Private Equity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	109,837	120,008
Unfunded Commitments	31,313	34,252
Venture Capital
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	81,643	109,361
Unfunded Commitments	1,217	1,324
Natural Resources
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	12,097	12,691
Unfunded Commitments	2,453	2,663
Private Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	6,567	6,454
Unfunded Commitments	1,663	2,777
Hedge Funds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	3,517	3,931
Unfunded Commitments	0	245
Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	(2,337)	6,668
Unfunded Commitments	$ 376	$ 383

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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