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Allowance for Credit Losses (Reserve Allowance for Various Credit Loss) (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 $ 6,407 $ 9,210
Transition adjustment current expected credit losses 449 (2,803)
Write-offs against allowance 0 0
Recoveries 0 0
September 30, 2022 6,856  
Trade Receivables    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 3,789 8,649
Transition adjustment current expected credit losses 578 (4,860)
Write-offs against allowance 0 0
Recoveries 0 0
September 30, 2022 4,367  
Investments, Fixed Maturities    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 2,101 60
Transition adjustment current expected credit losses (429) 2,041
Write-offs against allowance 0 0
Recoveries 0 0
September 30, 2022 1,672  
Investments, Other    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 517 501
Transition adjustment current expected credit losses 300 16
Write-offs against allowance 0 0
Recoveries 0 $ 0
September 30, 2022 $ 817