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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, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,469 $ 1,296 $ 4,431 $ 3,957
Interest cost 2,345 2,629 7,038 7,954
Expected return on plan assets (3,574) (3,677) (10,727) (10,904)
Curtailment gain     0 0
Net amortization and deferral 1,201 783 3,599 2,343
Net periodic benefit cost 1,441 1,031 4,341 3,350
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 106 108 320 336
Interest cost 387 458 1,186 1,423
Expected return on plan assets (15) (26) (45) (78)
Curtailment gain     0 (1,503)
Net amortization and deferral (44) (133) (132) (399)
Net periodic benefit cost $ 434 $ 407 $ 1,329 $ (221)