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Allowance for Credit Losses (Reserve Allowance for Various Credit Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Valuation And Qualifying Accounts [Abstract]      
March 31, 2022 $ 8,634 $ 8,105 $ 8,105
Transition adjustment current expected credit losses 4,420 12,217  
Write-offs against allowance 4,385   11,688
December 31, 2023 8,669   8,634
Trade Receivables      
Valuation And Qualifying Accounts [Abstract]      
March 31, 2022 5,082 6,236 6,236
Transition adjustment current expected credit losses 2,951   10,534
Write-offs against allowance 4,385   11,688
December 31, 2023 3,648   5,082
Investments, Fixed Maturities      
Valuation And Qualifying Accounts [Abstract]      
March 31, 2022 3,104 1,052 1,052
Transition adjustment current expected credit losses 1,469 2,052  
December 31, 2023 4,573   3,104
Investments, Other      
Valuation And Qualifying Accounts [Abstract]      
March 31, 2022 448 817 817
Transition adjustment current expected credit losses   $ 369  
December 31, 2023 $ 448   $ 448