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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
Aug. 03, 2012
Jul. 29, 2011
Jul. 30, 2010
Jul. 31, 2009
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% 80.00%    
Percentage of inventory valued using an average cost method 25.00% 25.00% 20.00%    
Property and equipment [Abstract]          
Depreciation expense   $ 63,705 $ 61,677 $ 59,930  
Depreciation expense related to store operations   58,423 [1] 56,985 [1] 56,402 [1]  
Derivative instruments and hedging activities [Abstract]          
Credit exposure to the counterparty if the company owes the counterparty 0 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, lifetime amount       1,000  
Group health limits, plan year amount   20 20 20 100
Group health annual limit for certain cases   8 8 8 15
Leases [Abstract]          
Maximum useful life of leases (in years)   35 years      
Advertising [Abstract]          
Net advertising expense   $ 56,198 $ 48,889 $ 45,239  
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.