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Fair Value Measurements - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Mar. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments $ 489,290 $ 497,221 $ 674,170
Debt securities available-for-sale 81,188 76,898 78,293
Warrant liability 1,128 0 [1]  
Prepaid forward liability 92    
Derivative liability 2,095 $ 3,513 $ 8,108
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Liabilities Liabilities
Level 1      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Warrant liability 1,128    
Prepaid forward liability 92    
Derivative liability 0 $ 0 $ 0
Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Warrant liability 0    
Prepaid forward liability 0    
Derivative liability 0 0 0
Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Warrant liability 0    
Prepaid forward liability 0    
Derivative liability 2,095 3,513 8,108
Public equity securities      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 5,051 8,837 69,769
Public equity securities | Level 1      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 5,051 8,837 69,769
Public equity securities | Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 0 0 0
Public equity securities | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 0 0 0
Put options      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 1,663 3,991  
Put options | Level 1      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 1,663 3,991  
Put options | Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 0 0  
Put options | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments 0 0  
Corporate debt securities (L Bonds)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 78,007 73,822 74,295
Corporate debt securities (L Bonds) | Level 1      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 0 0 0
Corporate debt securities (L Bonds) | Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 78,007 73,822 74,295
Corporate debt securities (L Bonds) | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 0 0 0
Other debt securities      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 3,181 3,076 3,998
Other debt securities | Level 1      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 0 0 0
Other debt securities | Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale 998 998 998
Other debt securities | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Debt securities available-for-sale $ 2,183 $ 2,078 $ 3,000
[1] Retroactively adjusted March 31, 2023 for the de-SPAC merger transaction as described in Note 4. Such adjustments are unaudited.