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Investments (Adjusted cost and estimated market value of available-for-sale investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 2,405,612 | $ 2,334,215
Available-for-sale securities, fair value: |  |
Estimated market value | 2,653,539 | 2,467,613
Us Government Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 90,142 | 128,747
Due after one year through five years | 562,442 | 547,821
Due after five years through ten years | 672,733 | 636,036
Due after ten years | 905,567 | 832,334
Amortized cost | 2,230,884 | 2,144,938
Available-for-sale securities, fair value: |  |
Due in one year or less | 91,190 | 129,420
Due after one year through five years | 601,818 | 566,934
Due after five years through ten years | 754,536 | 678,636
Due after ten years | 1,019,570 | 897,371
Estimated market value | 2,467,114 | 2,272,361
Mortgage backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 174,728 | 187,784
Available-for-sale securities, fair value: |  |
Estimated market value | 186,425 | 193,687
Redeemable Preferred Stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 0 | 1,493
Available-for-sale securities, fair value: |  |
Estimated market value | $ 0 | $ 1,565

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