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Executive Stock Plans And Stock-Based Compensation (Summary Of Stock Option And SAR Activity) (Details) - $ / shares
shares in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Outstanding at beginning of year, Weighted-Average Exercise Price $ 59.96 $ 59.82 $ 54.83
Outstanding at beginning of year, Shares 152,201 169,601 257,340
Exercised, Shares (135,334) (6,200) (63,539)
Cancelled/expired, Shares (16,867) (11,200) (24,200)
Outstanding at end of year, Shares 0 152,201 169,601
Exercised, Weighted-Average Exercise Price $ 61.72 $ 51.32 $ 38.50
Cancelled/expired, Weighted-Average Exercise Price 45.82 62.66 62.66
Outstanding at end of year, Weighted-Average Exercise Price $ 0 $ 59.96 $ 59.82