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Stock-based Compensation (Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units, FCF Restricted Stock Units And TSR Performance Restricted Stock Units) (Details) - $ / shares
shares in Thousands
9 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Time Lapse, EPS, FCF, Strategic Performance and Special Performance Restricted Stock Units [Member]    
Stock-based Compensation    
Nonvested at beginning of period, Units 1,652  
Granted, Units 1,331  
Vested, Units (689)  
Forfeited, Units (254)  
Nonvested at end of period, Units 2,040  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 47.01  
Granted, Weighted-Average Grant-Date Fair Value 36.50 $ 46.03
Vested, Weighted-Average Grant-Date Fair Value 47.77  
Forfeited, Weighted Average Grant Date Fair Value 40.99  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 40.64  
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 (710)  
Nonvested at end of period, Units 1,342  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 46.66  
Granted, Weighted-Average Grant-Date Fair Value 31.29 $ 39.39
Vested, Weighted-Average Grant-Date Fair Value 0.00  
Forfeited, Weighted Average Grant Date Fair Value 55.98  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 37.30