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Investments, at Fair Value - Investments at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
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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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- 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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