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Share-Based Compensation, Performance-Based Market Stock Units (Details) - shares
12 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Aug. 01, 2014
MSU Grants [Member]      
Fair Value Assumptions and Methodology [Abstract]      
Dividend yield [1] 0.00% 0.00% 0.00%
Expected volatility, minimum 23.00%    
Expected volatility   21.00% 25.00%
Expected volatility, maximum 24.00%    
Risk-free interest rate, minimum 0.90%   0.70%
Risk-free interest rate   1.00%  
Risk-free interest rate, maximum 1.00%   0.80%
2014 MSU Grants [Member]      
Fair Value Assumptions and Methodology [Abstract]      
Number of shares accrued (in shares) 37,786    
2015 MSU Grants [Member]      
Fair Value Assumptions and Methodology [Abstract]      
Number of shares accrued (in shares) 26,955    
2016 MSU Grants [Member]      
Fair Value Assumptions and Methodology [Abstract]      
Number of shares accrued (in shares) 6,865    
Omnibus Plan 2010 [Member] | MSU Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award performance period 3 years    
Maximum percentage of shares that may be awarded to the executives 150.00%    
Measurement period for average prices in consecutive calendar days 60 days    
Measurement period for average prices prior to first business day of performance period 30 days    
Measurement period for average prices after first business day of performance period 30 days    
[1] Dividends accrue on the 2014, 2015 and 2016 MSU Grants. Dividends will be forfeited for any 2014, 2015 and 2016 MSU Grants that do not vest.