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