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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2025
Jun. 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 2,420 $ 204
Unrealized net gain on investments 27,232 5,413
Change in fair value of cash flow hedges 4,766 1,905
Amounts reclassified into earnings on hedging activities 4,232 1,075
Other comprehensive income (loss) 29,118 8,597
Equity, Attributable to Parent, Ending Balance 7,660,768  
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]    
Equity, Attributable to Parent, Beginning Balance (57,540) (53,707)
Foreign currency translation 2,420 204
Other comprehensive income (loss) 2,420 204
Equity, Attributable to Parent, Ending Balance (55,120) (53,911)
Unrealized Net Gain on Investments [Member]    
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]    
Equity, Attributable to Parent, Beginning Balance (174,320) (176,883)
Unrealized net gain on investments 27,232 5,413
Other comprehensive income (loss) 27,232 5,413
Equity, Attributable to Parent, Ending Balance (147,088) (182,296)
Fair Value of Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]    
Equity, Attributable to Parent, Beginning Balance (56) 6,330
Change in fair value of cash flow hedges 4,766 1,905
Amounts reclassified into earnings on hedging activities 4,232 1,075
Other comprehensive income (loss) 534 2,980
Equity, Attributable to Parent, Ending Balance (590) 3,350
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
Equity, Attributable to Parent, Ending Balance 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 (229,314) (223,216)
Foreign currency translation 2,420 204
Unrealized net gain on investments 27,232 5,413
Change in fair value of cash flow hedges 4,766 1,905
Amounts reclassified into earnings on hedging activities 4,232 1,075
Equity, Attributable to Parent, Ending Balance $ (200,196) $ (231,813)