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Accumulated Other Comprehensive Income (Loss) (Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance $ 7,172,445 $ 6,504,191 $ 5,897,161
Foreign currency translation 3,833 2,832 782
Unrealized net loss on investments 2,563 55,857 289,477
Change in fair value of cash flow hedges 3,705 6,410 5,033
Amounts reclassified into earnings on hedging activities, net (10,091) (4,087) (582)
Change in post retirement benefit obligations 1,558 1,395 2,091
Other comprehensive income (loss) 6,098 62,407 283,717
Balance 7,498,143 7,172,445 6,504,191
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance 53,707 56,539 55,757
Foreign currency translation 3,833 2,832 782
Other comprehensive income (loss) 3,833 2,832 782
Balance 57,540 53,707 56,539
Unrealized Net Gains (Losses) on Investments [Member]      
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance 176,883 232,740 56,737
Unrealized net loss on investments 2,563 55,857 289,477
Other comprehensive income (loss) 2,563 55,857 289,477
Balance 174,320 176,883 232,740
Fair Value of Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance 6,330 4,007 444
Change in fair value of cash flow hedges 3,705 6,410 5,033
Amounts reclassified into earnings on hedging activities, net (10,091) (4,087) (582)
Other comprehensive income (loss) 6,386 2,323 4,451
Balance 56 6,330 4,007
Postretirement Benefit Obligation Net Loss [Member]      
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance 1,044 351 2,442
Change in post retirement benefit obligations 1,558 1,395 2,091
Other comprehensive income (loss) 1,558 1,395 2,091
Balance 2,602 1,044 351
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]      
Balance 223,216 285,623 1,906
Foreign currency translation 3,833 2,832 782
Unrealized net loss on investments 2,563 55,857 289,477
Change in fair value of cash flow hedges 3,705 6,410 5,033
Amounts reclassified into earnings on hedging activities, net (10,091) (4,087) (582)
Change in post retirement benefit obligations 1,558 1,395 2,091
Balance $ 229,314 $ 223,216 $ 285,623