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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
Jul. 30, 2017
Jul. 31, 2016
Aug. 02, 2015
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 2,004    
Granted, Units 586    
Vested, Units (990)    
Forfeited, Units (379)    
Nonvested at end of period, Units 1,221 2,004  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 45.08    
Granted, Weighted-Average Grant-Date Fair Value 54.79 $ 50.44 $ 43.00
Vested, Weighted-Average Grant-Date Fair Value 44.16    
Forfeited, Weighted Average Grant Date Fair Value 43.87    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 50.86 $ 45.08  
TSR Performance Restricted Stock/Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,641    
Granted, Units 606    
Vested, Units (251)    
Forfeited, Units (222)    
Nonvested at end of period, Units 1,774 1,641  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 49.13    
Granted, Weighted-Average Grant-Date Fair Value 39.53 $ 62.44 $ 43.39
Vested, Weighted-Average Grant-Date Fair Value 36.26    
Forfeited, Weighted Average Grant Date Fair Value 44.58    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 48.24 $ 49.13