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Investments, at Fair Value - Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value, Total available-for-sale debt securities with unrealized losses | $ 2,129 | $ 75,900
Unrealized Losses, Total available-for-sale debt securities with unrealized losses | 1,060 | 8,880
Corporate debt securities (L Bonds) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value, Twelve months or longer | 0 | 73,822
Unrealized Losses, Twelve months or longer | 0 | 7,924
Other debt securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value, Less than twelve months | 0 | 2,078
Fair Value, Twelve months or longer | 2,129 | 0
Unrealized Losses, Less than twelve months | 0 | 956
Unrealized Losses, Twelve months or longer | $ 1,060 | $ 0

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