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Stock-based Compensation (Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units And Strategic Performance Restricted Stock Units And TSR Performance Restricted Stock Units) (Details) - $ / shares
shares in Thousands
12 Months Ended
Aug. 02, 2015
Aug. 03, 2014
Jul. 28, 2013
Jul. 29, 2012
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]        
Stock-based Compensation        
Nonvested at beginning of period, Units 2,994      
Granted, Units 1,183      
Vested, Units (1,303)      
Forfeited, Units (464)      
Nonvested at end of period, Units 2,410 2,994    
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 37.69      
Granted, Weighted-Average Grant-Date Fair Value 43.00 $ 39.97 $ 35.44  
Vested, Weighted-Average Grant-Date Fair Value 35.89      
Forfeited, Weighted Average Grant Date Fair Value 37.00      
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 41.40 $ 37.69    
TSR Performance Restricted Stock/Units [Member]        
Stock-based Compensation        
Nonvested at beginning of period, Units 861      
Granted, Units 874     0
Vested, Units 0      
Forfeited, Units (156)      
Nonvested at end of period, Units 1,579 861    
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 38.15      
Granted, Weighted-Average Grant-Date Fair Value 43.39 $ 36.26 $ 39.76  
Vested, Weighted-Average Grant-Date Fair Value 0      
Forfeited, Weighted Average Grant Date Fair Value 41.23      
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 40.75 $ 38.15