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Investments, at Fair Value - Amortized Cost vs Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Amortized Cost Basis | $ 66,998 | $ 66,998 | $ 79,619
Gross Unrealized Gains | 24,468 | 18,780 | 1,445
Gross Unrealized Losses | (10,278) | (8,880) | (2,771)
Fair Value | 81,188 | 76,898 | 78,293
Corporate debt securities (L Bonds) |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Amortized Cost Basis | 64,313 | 64,313 | 76,934
Gross Unrealized Gains | 23,016 | 17,433 | 132
Gross Unrealized Losses | (9,322) | (7,924) | (2,771)
Fair Value | 78,007 | 73,822 | 74,295
Other debt securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Amortized Cost Basis | 2,685 | 2,685 | 2,685
Gross Unrealized Gains | 1,452 | 1,347 | 1,313
Gross Unrealized Losses | (956) | (956) | 0
Fair Value | $ 3,181 | $ 3,076 | $ 3,998

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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 (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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