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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
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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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).

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