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Summary Of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 03, 2012
Week
Aug. 02, 2013
Aug. 03, 2012
Week
Jul. 29, 2011
Fiscal year [Abstract]        
Number of weeks in a quarter 13   13  
Number of weeks in fiscal year     53  
Number of weeks in the fourth quarter 14      
Inventories [Abstract]        
Percentage of retail inventories valued using the retail inventory method (in hundredths)   75.00%    
Percentage of inventory valued using an average cost method (in hundredths)   25.00%    
Property and equipment [Abstract]        
Total depreciation expense   $ 65,351 $ 63,705 $ 61,677
Depreciation expense related to store operations   60,574 [1] 58,423 [1] 56,985 [1]
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    
Group health limits, plan year amount   20    
Group health annual limit for certain cases   8    
Leases [Abstract]        
Maximum useful life of leases (in years)   35 years    
Advertising [Abstract]        
Advertising expense   $ 59,957 $ 56,198 $ 48,889
Income taxes [Abstract]        
Minimum percentage used to determine likelihood of success of a tax position taken   50.00%    
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.