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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $76,154 and $127,284)	$ 374,603	$ 385,851	$ 524,927
Debt securities available-for-sale	81,188	76,898	78,293
Equity securities without readily determinable fair value	26,800	21,600	1,200
Ben
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $76,154 and $127,284)	0	0	0
Public equity securities and option	1,690	4,742	13,625
Debt securities available-for-sale	656	620	624
Equity securities without readily determinable fair value	0	0	0
Total investments, at fair value	2,346	5,362	14,249
Customer ExAlt Trusts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments held by Customer ExAlt Trusts (related party of $76,154 and $127,284)	374,603	385,851	524,927
Public equity securities and option	5,023	8,087	56,144
Debt securities available-for-sale	80,532	76,278	77,669
Equity securities without readily determinable fair value	26,786	21,643	1,181
Total investments, at fair value	$ 486,944	$ 491,859	$ 659,921

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Equity Securities and Options, Fair Value Disclosure

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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
-Subparagraph (a)
-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).

+ References

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
-SubTopic 10
-Name Accounting Standards Codification
-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
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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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
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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