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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
3 Months Ended
Oct. 27, 2019
Oct. 28, 2018
Time Lapse, EPS Performance, FCF Performance And Strategic Performance Restricted Stock Units [Member]    
Stock-based Compensation    
Nonvested at beginning of period, Units 1,960  
Granted, Units 1,073  
Vested, Units (650)  
Forfeited, Units (139)  
Nonvested at end of period, Units 2,244  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 40.57  
Granted, Weighted-Average Grant-Date Fair Value 46.79 $ 36.38
Vested, Weighted-Average Grant-Date Fair Value 43.04  
Forfeited, Weighted Average Grant Date Fair Value 41.04  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 42.80  
TSR Performance Restricted Stock/Units [Member]    
Stock-based Compensation    
Nonvested at beginning of period, Units 1,308  
Granted, Units 619  
Vested, Units 0  
Forfeited, Units (502)  
Nonvested at end of period, Units 1,425  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 37.33  
Granted, Weighted-Average Grant-Date Fair Value 63.06 $ 31.29
Vested, Weighted-Average Grant-Date Fair Value 0  
Forfeited, Weighted Average Grant Date Fair Value 38.99  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 47.92