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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