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Executive Stock Plans And Stock-Based Compensation (Summary Of Stock Option And SAR Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Outstanding at beginning of year, Weighted-Average Exercise Price $ 59.82 $ 54.83 $ 50.07
Outstanding at beginning of year, Shares 169,601 257,340 418,477
Exercised, Shares (6,200) (63,539) (161,137)
Cancelled/expired, Shares (11,200) (24,200)  
Outstanding at end of year, Shares 152,201 169,601 257,340
Exercised, Weighted-Average Exercise Price $ 51.32 $ 38.50 $ 42.48
Cancelled/expired, Weighted-Average Exercise Price 62.66 62.66  
Outstanding at end of year, Weighted-Average Exercise Price $ 59.96 $ 59.82 $ 54.83
Outstanding at end of year, Weighted-Average Contractual Term 1 year 1 month 20 days    
Outstanding at end of year, Aggregate Intrinsic Value $ 302