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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
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Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 2,660,093 | $ 3,006,587
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 6,087 | 5,319
Gross unrealized losses more than 12 months | (222,624) | (300,768)
Allowance for expected credit loss | (1,052) | (2,101)
Available for sale investments, estimated market value | 2,442,504 | 2,709,037
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 191,070 | 353,189
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 2,123 | 3,061
Gross unrealized losses more than 12 months | (8,921) | (11,574)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 184,272 | 344,676
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 48,067 | 34,126
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 250 | 40
Gross unrealized losses more than 12 months | (7,664) | (6,935)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 40,653 | 27,231
Obligations of states and political subdivisions [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 151,197 | 161,960
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 918 | 649
Gross unrealized losses more than 12 months | (7,533) | (12,104)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | 144,582 | 150,505
Corporate securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 1,963,249 | 2,086,432
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 2,762 | 1,491
Gross unrealized losses more than 12 months | (152,799) | (216,589)
Allowance for expected credit loss | (1,052) | (2,101)
Available for sale investments, estimated market value | 1,812,160 | 1,869,233
Mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 306,510 | 370,880
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 34 | 78
Gross unrealized losses more than 12 months | (45,707) | (53,566)
Allowance for expected credit loss | 0 | 0
Available for sale investments, estimated market value | $ 260,837 | $ 317,392

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- Definition Amount of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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