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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 5,192 $ 5,214 $ 6,172
Interest cost 11,943 11,566 9,670
Expected return on plan assets (14,874) (15,504) (13,630)
Settlement cost 14,101 0 0
Net amortization and deferral (15) 659 (2,038)
Net periodic benefit cost 16,377 1,935 4,250
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 75 239 115
Interest cost 1,062 1,049 944
Expected return on plan assets (53) (63) (76)
Settlement cost 0 0 0
Net amortization and deferral 662 791 737
Net periodic benefit cost $ 422 $ 434 $ 246