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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 9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,549 $ 1,678 $ 4,597 $ 4,981
Interest cost 2,341 2,212 7,027 6,725
Expected return on plan assets (3,323) (3,373) (9,971) (10,145)
Net amortization and deferral 1,001 976 3,003 2,928
Net periodic benefit cost 1,568 1,493 4,656 4,489
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 33 43 97 137
Interest cost 236 265 712 745
Expected return on plan assets (18) (21) (56) (65)
Net amortization and deferral (168) (115) (507) (346)
Net periodic benefit cost $ 83 $ 172 $ 246 $ 471