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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,529 $ 1,433 $ 4,595 $ 4,340
Interest cost 2,678 2,503 8,125 7,469
Expected return on plan assets (4,151) (3,693) (12,557) (11,081)
Net amortization and deferral 696 902 2,092 2,706
Net periodic benefit cost 752 1,145 2,255 3,434
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 53 60 159 177
Interest cost 322 342 986 1,012
Expected return on plan assets (24) (24) (80) (74)
Net amortization and deferral (154) (193) (459) (581)
Net periodic benefit cost $ 197 $ 185 $ 606 $ 534