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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Amortized cost | $ 2,989,120 | $ 2,664,037
Gross unrealized gain | 1,963 | 170,294
Gross unrealized losses more than 12 months | (53,121) | (445)
Gross unrealized losses less than 12 months | (272,191) | (12,734)
Allowance for expected credit loss | (2,243) | (60)
Available for sale investments, estimated market value | 2,663,528 | 2,821,092
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 353,331 | 128,078
Gross unrealized gain | 582 | 7,984
Gross unrealized losses more than 12 months | (3,844) | 0
Gross unrealized losses less than 12 months | (7,761) | (969)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 342,308 | 135,093
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 34,920 | 44,678
Gross unrealized gain | 58 | 280
Gross unrealized losses more than 12 months | (6,263) | (42)
Gross unrealized losses less than 12 months | (602) | (3,111)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 28,113 | 41,805
Obligations of states and political subdivisions [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 164,547 | 178,040
Gross unrealized gain | 503 | 15,450
Gross unrealized losses more than 12 months | (3,458) | 0
Gross unrealized losses less than 12 months | (10,609) | (508)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 150,983 | 192,982
Corporate securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 2,060,503 | 1,989,212
Gross unrealized gain | 790 | 138,909
Gross unrealized losses more than 12 months | (39,556) | (402)
Gross unrealized losses less than 12 months | (210,257) | (6,604)
Allowance for expected credit loss | (2,243) | (60)
Available for sale investments, estimated market value | 1,809,237 | 2,121,055
Mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 375,819 | 324,029
Gross unrealized gain | 30 | 7,671
Gross unrealized losses more than 12 months | 0 | (1)
Gross unrealized losses less than 12 months | (42,962) | (1,542)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | $ 332,887 | $ 330,157

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- Definition Amount of accumulated unrealized loss on investments in debt and/or equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or less. + References No definition available. + Details
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