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Investments, at Fair Value - Alternative Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 374,603	$ 385,851	$ 524,927
Unfunded Commitments	60,157	61,135	69,093
Venture Capital
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	164,097	165,933	209,912
Unfunded Commitments	2,877	2,810	3,035
Private Equity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	143,714	145,073	199,280
Unfunded Commitments	46,838	47,218	55,269
Natural Resources
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	27,832	27,756	31,736
Unfunded Commitments	4,567	5,240	4,994
Hedge Funds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	19,291	24,935	51,974
Unfunded Commitments	337	337	358
Redeemable investments	10,800	16,400
Private Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	10,436	10,391	15,757
Unfunded Commitments	4,808	4,800	4,802
Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	9,233	11,763	16,268
Unfunded Commitments	$ 730	$ 730	$ 635

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- Definition

Fair Value, Alternative Investments, Entities that Calculate Net Asset Value Per Share, Redeemable

+ References

No definition available.

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- 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

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
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-Section 50
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