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Investments (Available-for-sale investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | $ 3,006,587 | $ 2,664,037
Gross unrealized gains | 5,319 | 170,294
Gross unrealized losses more than 12 months | (118,943) | (445)
Gross unrealized losses less than 12 months | (181,825) | (12,734)
Allowance for Expected Credit Losses | (2,101) | (60)
Fair Value | 2,709,037 | 2,821,092
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | 353,189 | 128,078
Gross unrealized gains | 3,061 | 7,984
Gross unrealized losses more than 12 months | (7,639) | 0
Gross unrealized losses less than 12 months | (3,935) | (969)
Allowance for Expected Credit Losses | 0 | 0
Fair Value | 344,676 | 135,093
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | 34,126 | 44,678
Gross unrealized gains | 40 | 280
Gross unrealized losses more than 12 months | (6,707) | (42)
Gross unrealized losses less than 12 months | (228) | (3,111)
Allowance for Expected Credit Losses | 0 | 0
Fair Value | 27,231 | 41,805
Obligations of states and political subdivisions [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | 161,960 | 178,040
Gross unrealized gains | 649 | 15,450
Gross unrealized losses more than 12 months | (4,014) | 0
Gross unrealized losses less than 12 months | (8,090) | (508)
Allowance for Expected Credit Losses | 0 | 0
Fair Value | 150,505 | 192,982
Corporate securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | 2,086,432 | 1,989,212
Gross unrealized gains | 1,491 | 138,909
Gross unrealized losses more than 12 months | (60,224) | (402)
Gross unrealized losses less than 12 months | (156,365) | (6,604)
Allowance for Expected Credit Losses | (2,101) | (60)
Fair Value | 1,869,233 | 2,121,055
Mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost, equity investments | 370,880 | 324,029
Gross unrealized gains | 78 | 7,671
Gross unrealized losses more than 12 months | (40,359) | (1)
Gross unrealized losses less than 12 months | (13,207) | (1,542)
Allowance for Expected Credit Losses | 0 | 0
Fair Value | $ 317,392 | $ 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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- Definition This item represents the aggregate fair value of investments in debt and/or equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition We used "AvailableForSaleSecuritiesGrossUnrealizedGainLoss" in prior filings for this concept, but the 2013 taxonomy deprecated the above concept and created a new one with the period type changed to 'duration.' We must have an 'instant' period type in order to complete the calculation within this schedule. This is the unrealized gain on all our available-for-sale investments as of the quarter ending date. + References No definition available. + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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