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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
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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

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