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Investments (Adjusted cost and estimated market value of available-for-sale investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | ---
Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 2,664,037 | $ 2,405,612
Available-for-sale securities, fair value: |  |
Estimated market value | 2,821,092 | 2,653,539
Us Government Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 97,969 | 90,142
Due after one year through five years | 541,840 | 562,442
Due after five years through ten years | 704,295 | 672,733
Due after ten years | 995,904 | 905,567
Amortized cost | 2,340,008 | 2,230,884
Available-for-sale securities, fair value: |  |
Due in one year or less | 99,432 | 91,190
Due after one year through five years | 570,135 | 601,818
Due after five years through ten years | 765,073 | 754,536
Due after ten years | 1,056,295 | 1,019,570
Estimated market value | 2,490,935 | 2,467,114
Mortgage backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 324,029 | 174,728
Available-for-sale securities, fair value: |  |
Estimated market value | $ 330,157 | $ 186,425

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 + Details
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