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Allowance for Credit Losses (Reserve Allowance for Various Credit Loss) (Details) - USD ($) $ in Thousands | 6 Months Ended
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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 |

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