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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,322 $ 1,282
Interest cost 2,872 2,901
Expected return on plan assets (3,607) (3,888)
Net amortization and deferral 174 203
Net periodic benefit cost 761 498
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 24 25
Interest cost 271 264
Expected return on plan assets (14) (16)
Net amortization and deferral (160) (189)
Net periodic benefit cost $ 121 $ 84