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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
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Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 2,671,587 | $ 2,708,562
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 7,128 | 2,915
Gross unrealized losses more than 12 months | (179,713) | (228,875)
Allowance for expected credit loss | (4,573) | (3,104)
Available for sale investments, estimated market value | 2,494,429 | 2,479,498
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 106,730 | 119,289
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 262 | 206
Gross unrealized losses more than 12 months | (6,012) | (8,353)
Available for sale investments, estimated market value | 100,980 | 111,142
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 79,463 | 81,909
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 513 | 232
Gross unrealized losses more than 12 months | (7,532) | (8,712)
Available for sale investments, estimated market value | 72,444 | 73,429
Obligations of states and political subdivisions [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 130,669 | 137,280
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 413 | 272
Gross unrealized losses more than 12 months | (8,297) | (8,808)
Available for sale investments, estimated market value | 122,785 | 128,744
Corporate securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 1,737,046 | 1,807,605
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 3,268 | 1,623
Gross unrealized losses more than 12 months | (120,702) | (155,749)
Allowance for expected credit loss | (4,573) | (3,104)
Available for sale investments, estimated market value | 1,615,039 | 1,650,375
Mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 617,679 | 562,479
Available For Sale Debt Securities Accumulated Gross Unrealized Gain | 2,672 | 582
Gross unrealized losses more than 12 months | (37,170) | (47,253)
Available for sale investments, estimated market value | $ 583,181 | $ 515,808

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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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