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Executive Stock Plans And Stock-Based Compensation (Summary Of RSU, Restricted Stock, And PSA Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 80,932 94,539 70,092  
Vested, Shares (42,384) (123,322) (69,046)  
Forfeited, Shares   0 0  
Unvested at end of year, Shares 302,945 264,397 293,180 292,134
Granted, Weighted- Average Grant Date Fair Value $ 51.62 $ 51.86 $ 57.79  
Vested, Weighted- Average Grant Date Fair Value 41.64 42.02 44.89  
Forfeited, Weighted- Average Grant Date Fair Value   0.00 0.00  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 49.95 $ 48.10 $ 44.33 $ 41.23
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 0 0 0  
Vested, Shares 0 0 (11,750)  
Forfeited, Shares   0 0  
Unvested at end of year, Shares 48,100 48,100 48,100 59,850
Granted, Weighted- Average Grant Date Fair Value $ 0.00 $ 0.00 $ 0.00  
Vested, Weighted- Average Grant Date Fair Value 0.00 0.00 39.02  
Forfeited, Weighted- Average Grant Date Fair Value   0.00 0.00  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 42.33 $ 42.33 $ 42.33 $ 41.68
Performance Share Awards Psas [Member        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 86,212 57,580 52,400  
Vested, Shares (85,387) (50,092) (32,464)  
Forfeited, Shares   (3,400) (5,566)  
Unvested at end of year, Shares 154,300 153,475 149,387 135,017
Granted, Weighted- Average Grant Date Fair Value $ 45.06 $ 46.41 $ 53.56  
Vested, Weighted- Average Grant Date Fair Value 38.14 31.95 33.95  
Forfeited, Weighted- Average Grant Date Fair Value   53.56 37.45  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 48.13 $ 45.58 $ 41.76 $ 35.12