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Share-Based Compensation, Performance-Based Market Stock Units (Details)
12 Months Ended
Aug. 03, 2018
shares
2018 rTSR RSUs [Member]  
Fair Value Assumptions and Methodology [Abstract]  
Number of shares accrued (in shares) 3,368
2017 rTSR RSUs [Member]  
Fair Value Assumptions and Methodology [Abstract]  
Number of shares accrued (in shares) 5,676
2016 MSU Grants [Member]  
Fair Value Assumptions and Methodology [Abstract]  
Expected volatility, minimum 23.00%
Expected volatility, maximum 24.00%
Risk-free interest rate, minimum 0.90%
Risk-free interest rate, maximum 1.00%
Number of shares accrued (in shares) 20,334
Omnibus Plan 2010 [Member] | MSU Grants [Member]  
Performance-Based Market Stock Units [Abstract]  
Award performance period 3 years
Measurement period for average stock prices in consecutive calendar days 60 days
Measurement period for average stock prices prior to first business day of performance period 30 days
Measurement period for average stock prices after first business day of performance period 30 days
Omnibus Plan 2010 [Member] | MSU Grants [Member] | Maximum [Member]  
Performance-Based Market Stock Units [Abstract]  
Percentage of shares of target award that may be awarded 150.00%