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Allowance for Credit Losses (Reserve Allowance Various Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | $ 9,210 | $ 6,242
Transition adjustment expected credit loss current | (2,803) | 2,968
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2023 | 6,407 | 9,210
Trade Receivables |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 8,649 | 4,421
Transition adjustment expected credit loss current | (4,860) | 4,228
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2023 | 3,789 | 8,649
Investments, Fixed Maturities |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 60 | 1,320
Transition adjustment expected credit loss current | 2,041 | (1,260)
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2023 | 2,101 | 60
Investments, Other |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 501 | 501
Transition adjustment expected credit loss current | 16 | 0
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2023 | $ 517 | $ 501

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