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Investments, at Fair Value - Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value, Total available-for-sale debt securities with unrealized losses | $ 80,190 | $ 75,900 | $ 74,295
Unrealized Losses, Total available-for-sale debt securities with unrealized losses | 10,278 | 8,880 | 2,771
Corporate debt securities (L Bonds) |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value, Less than twelve months |  | 0 | 74,295
Fair Value, Twelve months or longer | 78,007 | 73,822 | 0
Unrealized Losses, Less than twelve months |  | 0 | 2,771
Unrealized Losses, Twelve months or longer | 9,322 | 7,924 | 0
Other debt securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value, Less than twelve months | 0 | 2,078 | 0
Fair Value, Twelve months or longer | 2,183 | 0 |
Unrealized Losses, Less than twelve months | 0 | 956 | $ 0
Unrealized Losses, Twelve months or longer | $ 956 | $ 0 |

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