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Accumulated Other Comprehensive Loss (Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance     $ 7,498,143  
Foreign currency translation $ 1,459 $ 421 961 $ 217
Unrealized net gain on investments 12,202 4,032 39,434 9,445
Change in fair value of cash flow hedges 329 1,696 4,437 209
Amounts reclassified into earnings on hedging activities, (net) 680 7,103 3,552 8,178
Other comprehensive income (loss) 10,392 9,018 39,510 17,615
Equity, Attributable to Parent, Ending Balance 7,767,887   7,767,887  
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (55,120) (53,911) (57,540) (53,707)
Foreign currency translation 1,459 421 961 217
Other comprehensive income (loss) 1,459 421 961 217
Equity, Attributable to Parent, Ending Balance (56,579) (53,490) (56,579) (53,490)
Unrealized Net Gain on Investments [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (147,088) (182,296) (174,320) (176,883)
Unrealized net gain on investments 12,202 4,032 39,434 9,445
Other comprehensive income (loss) 12,202 4,032 39,434 9,445
Equity, Attributable to Parent, Ending Balance (134,886) (186,328) (134,886) (186,328)
Fair Value of Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (590) 3,350 (56) 6,330
Change in fair value of cash flow hedges 329 1,696 4,437 209
Amounts reclassified into earnings on hedging activities, (net) 680 7,103 3,552 8,178
Other comprehensive income (loss) 351 5,407 885 8,387
Equity, Attributable to Parent, Ending Balance (941) (2,057) (941) (2,057)
Postretirement Benefit Obligation Gain [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance 2,602 1,044 2,602 1,044
Equity, Attributable to Parent, Ending Balance 2,602 1,044 2,602 1,044
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (200,196) (231,813) (229,314) (223,216)
Foreign currency translation 1,459 421 961 217
Unrealized net gain on investments 12,202 4,032 39,434 9,445
Change in fair value of cash flow hedges 329 1,696 4,437 209
Amounts reclassified into earnings on hedging activities, (net) 680 7,103 3,552 8,178
Other comprehensive income (loss) 10,392 9,018 39,510 17,615
Equity, Attributable to Parent, Ending Balance $ (189,804) $ (240,831) $ (189,804) $ (240,831)