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Share-Based Compensation, Stock Options (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Aug. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Yearly exercisable cumulative rate 33.00%    
Number of years to expiration date from grant date 10 years    
Fixed options, shares [Roll Forward]      
Outstanding, beginning of period (in shares) 20,458    
Granted (in shares) 0 0 0
Exercised (in shares) (7,775)    
Forfeited (in shares) 0    
Canceled (in shares) 0    
Outstanding, end of period (in shares) 12,683 20,458  
Exercisable (in shares) 12,683    
Fixed options, weighted-average price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 33.88    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 35.78    
Forfeited (in dollars per share) 0    
Canceled (in dollars per share) 0    
Outstanding, end of period (in dollars per share) 32.71 $ 33.88  
Exercisable (in dollars per share) $ 32.71    
Fixed options, weighted-average remaining contractual term [Abstract]      
Outstanding 1 year 2 months 23 days    
Exercisable 1 year 2 months 23 days    
Fixed options, aggregate intrinsic value [Abstract]      
Outstanding $ 1,582    
Exercisable 1,582    
Total intrinsic values of options exercised [1] $ 917 $ 4,652 $ 169
[1] The intrinsic value for stock options is defined as the difference between the current market value and the grant price.