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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
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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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- 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 + Details
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