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Fair Value Measurements - Narrative (Details)
$ in Thousands
6 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Guarantees of Farmers | Discounted Cash Flow Valuation Technique | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Market interest rate (as a percent) 15.00%  
Guarantees of Farmers | Discounted Cash Flow Valuation Technique | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Market interest rate (as a percent) 75.80%  
Securitized Beneficial Interests    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Unrealized losses for securitized beneficial interests $ 926 $ 623
Securitized Beneficial Interests | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Payment speed 65 days  
Discount rate (as a percent) 3.50%  
Securitized Beneficial Interests | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Payment speed 73 days  
Discount rate (as a percent) 4.60%  
Loss Severity | Guarantees of Farmers | Historical Loss Valuation Technique | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Historical loss (as a percent) 0.022  
Loss Severity | Guarantees of Farmers | Historical Loss Valuation Technique | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Historical loss (as a percent) 0.100