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Stock-based Compensation (Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units. FCF Performance Restricted Stock Units, Strategic Performance Restricted Stock Units And TSR Performance Restricted Stock Units) (Details) - $ / shares
shares in Thousands
12 Months Ended
Jul. 28, 2019
Jul. 29, 2018
Jul. 30, 2017
Time Lapse, EPS Performance, FCF Performance And Strategic Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,652    
Granted, Units 1,340    
Vested, Units (711)    
Forfeited, Units (321)    
Nonvested at end of period, Units 1,960 1,652  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 47.01    
Granted, Weighted-Average Grant-Date Fair Value 36.51 $ 44.18 $ 54.79
Vested, Weighted-Average Grant-Date Fair Value 47.83    
Forfeited, Weighted Average Grant Date Fair Value 40.67    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 40.57 $ 47.01  
TSR Performance Restricted Stock/Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,664    
Granted, Units 388    
Vested, Units 0    
Forfeited, Units (744)    
Nonvested at end of period, Units 1,308 1,664  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 46.66    
Granted, Weighted-Average Grant-Date Fair Value 31.29 $ 39.39 $ 39.53
Vested, Weighted-Average Grant-Date Fair Value 0.00    
Forfeited, Weighted Average Grant Date Fair Value 55.07    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 37.33 $ 46.66