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Share-Based Compensation Plans Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Jul. 29, 2016
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense   $ 7,269 $ 2,958 $ 1,600
Tax benefit recognized   2,762 1,124 608
Total intrinsic value of options   333 195 567
Cash received from exercise of stock options   518 214 534
Excess tax benefits   (499) 1,661 228
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 291    
Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period   4 months    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 0    
Total fair value of awards   4,844    
Total fair value of vested awards   7,634    
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   0    
Restricted Stock Awards and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of awards   3,841 6,092 4,649
Total fair value of vested awards   $ 9,221 $ 5,601 $ 10,136
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, expiration period   10 years    
Number of shares available for grant (in shares)   2.9    
2010 Plan | Employee | Restricted Stock 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 Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year