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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $3,759 and $76,154)	$ 302,810	$ 385,851
Debt securities available-for-sale	3,127	76,898
Other equity securities and interests	64,500	21,600
Ben
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $3,759 and $76,154)	0	0
Public equity securities and option	0	4,742
Debt securities available-for-sale	0	620
Other equity securities and interests	38	0
Total investments, at fair value	38	5,362
Customer ExAlt Trusts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $3,759 and $76,154)	302,810	385,851
Public equity securities and option	4,210	8,087
Debt securities available-for-sale	3,127	76,278
Other equity securities and interests	68,235	21,643
Total investments, at fair value	$ 378,382	$ 491,859

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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.

+ 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
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Amount of investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
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-Section 50
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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.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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