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Investments (Adjusted cost and estimated market value of available-for-sale investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 2,334,215 | $ 2,228,961
Available-for-sale securities, fair value: |  |
Estimated market value | 2,467,613 | 2,211,229
Us Government Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 128,747 | 71,987
Due after one year through five years | 547,821 | 541,195
Due after five years through ten years | 636,036 | 621,031
Due after ten years | 832,334 | 845,052
Amortized cost | 2,144,938 | 2,079,265
Available-for-sale securities, fair value: |  |
Due in one year or less | 129,420 | 71,954
Due after one year through five years | 566,934 | 540,658
Due after five years through ten years | 678,636 | 614,485
Due after ten years | 897,371 | 834,769
Estimated market value | 2,272,361 | 2,061,866
Mortgage backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 187,784 | 148,203
Available-for-sale securities, fair value: |  |
Estimated market value | 193,687 | 147,895
Redeemable Preferred Stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 1,493 | 1,493
Available-for-sale securities, fair value: |  |
Estimated market value | $ 1,565 | $ 1,468

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