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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
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Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 2,776,940 | $ 2,660,093
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 9,980 | 6,087
Gross unrealized losses more than 12 months | (166,745) | (222,624)
Allowance for expected credit loss | (3,049) | (1,052)
Available for sale investments, estimated market value | 2,617,126 | 2,442,504
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 141,224 | 191,070
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 371 | 2,123
Gross unrealized losses more than 12 months | (6,094) | (8,921)
Available for sale investments, estimated market value | 135,501 | 184,272
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 86,443 | 48,067
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 229 | 250
Gross unrealized losses more than 12 months | (7,944) | (7,664)
Available for sale investments, estimated market value | 78,728 | 40,653
Obligations of states and political subdivisions [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 140,373 | 151,197
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 758 | 918
Gross unrealized losses more than 12 months | (5,468) | (7,533)
Available for sale investments, estimated market value | 135,663 | 144,582
Corporate securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 1,879,165 | 1,963,249
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 5,643 | 2,762
Gross unrealized losses more than 12 months | (111,690) | (152,799)
Allowance for expected credit loss | (3,049) | (1,052)
Available for sale investments, estimated market value | 1,770,069 | 1,812,160
Mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 529,735 | 306,510
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 2,979 | 34
Gross unrealized losses more than 12 months | (35,549) | (45,707)
Available for sale investments, estimated market value | $ 497,165 | $ 260,837

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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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