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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 5,190 $ 4,650 $ 4,614
Interest cost 12,223 13,001 13,959
Expected return on plan assets (14,218) (14,632) (14,958)
Settlement cost 1,094 3,304 0
Net amortization and deferral 6,779 10,299 6,309
Net periodic benefit cost 11,068 16,622 9,924
Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 527 467 591
Interest cost 2,106 2,303 2,636
Expected return on plan assets (119) (124) (134)
Settlement cost 0 0 0
Net amortization and deferral (5) (8) (335)
Net periodic benefit cost $ 2,509 $ 2,638 $ 2,758