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Investments, at Fair Value - Alternative Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 302,810	$ 385,851
Unfunded Commitments	49,429	61,135
Venture Capital
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	139,950	165,933
Unfunded Commitments	2,366	2,810
Private Equity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	123,664	145,073
Unfunded Commitments	39,949	47,218
Natural Resources
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	20,505	27,756
Unfunded Commitments	3,351	5,240
Private Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	9,119	10,391
Unfunded Commitments	3,134	4,800
Hedge Funds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	6,135	24,935
Unfunded Commitments	246	337
Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	3,437	11,763
Unfunded Commitments	$ 383	$ 730

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 54B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A

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