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Summary Of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2015
Aug. 01, 2014
Aug. 02, 2013
Property and equipment [Abstract]      
Total depreciation expense $ 72,390 $ 67,620 $ 65,351
Depreciation expense related to store operations [1] 66,754 62,746 60,574
Derivative instruments and hedging activities [Abstract]      
Credit exposure to the counterparty if the company owes the counterparty 0    
Insurance [Abstract]      
Threshold amount for workers' compensation insurance Level 1 250    
Threshold amount for workers' compensation insurance Level 2 500    
Threshold amount for workers' compensation insurance Level 3 1,000    
Threshold amount for general liability insurance $ 500    
Leases [Abstract]      
Maximum useful life of leases 35 years    
Advertising [Abstract]      
Advertising expense $ 68,665 $ 63,707 $ 59,957
Minimum [Member]      
Inventory [Line Items]      
Percentage of retail inventories valued using the retail inventory method (in hundredths) 70.00%    
Maximum [Member]      
Inventory [Line Items]      
Percentage of retail inventories valued using the retail inventory method (in hundredths) 75.00%    
Buildings and Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 30 years    
Buildings and Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 45 years    
Buildings under Capital Leases [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 15 years    
Buildings under Capital Leases [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 25 years    
Restaurant and Other Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 2 years    
Restaurant and Other Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 10 years    
Leasehold Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 1 year    
Leasehold Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 35 years    
[1] Depreciation expense related to store operations is included in other store operating expenses in the Consolidated Statements of Income.