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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. 29, 2018
Jul. 30, 2017
Jul. 31, 2016
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,221    
Granted, Units 1,220    
Vested, Units (643)    
Forfeited, Units (146)    
Nonvested at end of period, Units 1,652 1,221  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 50.86    
Granted, Weighted-Average Grant-Date Fair Value 44.18 $ 54.79 $ 50.44
Vested, Weighted-Average Grant-Date Fair Value 48.67    
Forfeited, Weighted Average Grant Date Fair Value 48.27    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 47.01 $ 50.86  
TSR Performance Restricted Stock/Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,774    
Granted, Units 943    
Vested, Units (815)    
Forfeited, Units (238)    
Nonvested at end of period, Units 1,664 1,774  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 48.24    
Granted, Weighted-Average Grant-Date Fair Value 39.39 $ 39.53 $ 62.44
Vested, Weighted-Average Grant-Date Fair Value 43.39    
Forfeited, Weighted Average Grant Date Fair Value 43.53    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 46.66 $ 48.24