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Debt - Interest Rates at Period End (Details) - USD ($)
12 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Standby Letters of Credit    
Line of Credit Facility [Line Items]    
Debt instrument, effective interest rate 1.75% 2.00%
Line of credit $ 0 $ 0
Credit Agreement - Term Loan (matures April 2020)    
Line of Credit Facility [Line Items]    
Debt instrument, effective interest rate 2.98% 2.49%
Credit Agreement - Revolving facility (matures April 2020)    
Line of Credit Facility [Line Items]    
Debt instrument, effective interest rate 0.00% 0.00%
Unutilized commitment fee (in percent) 0.35% 0.40%