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Share-Based Compensation Plans Narrative (Details) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Jul. 24, 2015
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation cost   $ 6,127,000 $ 2,967,000 $ 7,105,000
Tax benefit recognized   1,661,000 228,000 1,756,000
Total intrinsic value of options   195,000 567,000 8,124,000
Cash received from options exercises   214,000 534,000 13,432,000
Excess tax benefits   1,661,000 228,000 1,756,000
Total fair value of vested awards   $ 5,601,000 10,136,000 7,813,000
Number of shares available for grant   3.4    
Restricted Stock Awards and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit recognized   $ 2,328,000 1,127,000 2,700,000
Unrecognized compensation cost   5,085,000    
Total fair value of awards   6,092,000 $ 4,649,000 $ 9,340,000
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   0    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 2,363,000    
Weighted average period   1 year 11 months 27 days    
Total fair value of awards   $ 3,848,000    
Minimum | Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period   1 year 8 months 9 days    
Minimum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   0.00%    
Maximum | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period   1 year 9 months 29 days    
Maximum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   150.00%    
SERP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum discount from fair market value at date of grant   50.00%    
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, expiration period   10 years    
2010 Plan | Employee | Restricted Stock Awards and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
2010 Plan | Employee | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years 3 years    
2010 Plan | Non-Employee Directors | Restricted Stock Awards and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Performance Incentive Plan | Restricted Stock Awards and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years