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Allowance for Credit Losses (Reserve Allowance Various Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2023 | $ 3,789 |
March 31, 2024 | 6,236 | $ 3,789
Trade Receivables |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2023 | 3,789 | 8,649
Transition adjustment current expected credit losses | 2,447 | 4,860
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2024 | 6,236 | 3,789
Investments, Fixed Maturities |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2023 | 2,101 | 60
Transition adjustment current expected credit losses | 1,049 | 2,041
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2024 | 1,052 | 2,101
Investments, Other |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2023 | 517 | 501
Transition adjustment current expected credit losses | 300 | 16
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2024 | 817 | 517
Allowance For Credit Loss [Member] |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2023 | 6,407 | 9,210
Transition adjustment current expected credit losses | 1,698 | 2,803
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2024 | $ 8,105 | $ 6,407

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