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Stock Plans (Disclosure Of Share-Based Compensation Arrangements By Share-based Payment Award) (Details) - Stock-Based Compensation Plan [Member] - $ / shares
3 Months Ended 12 Months Ended
Feb. 02, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   8,805   6,550
Weighted-average grant date fair value   $ 31.26   $ 32.25
Director Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   5,600   3,200
Weighted-average grant date fair value   $ 32.40   $ 32.25
Vesting period   1 year 1 year  
Award Date One [Member] | Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   3,155   3,300
Weighted-average grant date fair value   $ 29.22   $ 32.25
Vesting period 3 years 3 years 4 years  
Award Date One [Member] | Omnibus Plan [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, percentage per year   33.00% 25.00%  
Award Date Two [Member] | Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   50   50
Weighted-average grant date fair value   $ 31.50   $ 32.50
Vesting period   1 year 1 year