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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
3 Months Ended
Oct. 29, 2017
Oct. 30, 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 657  
Vested, Units (602)  
Forfeited, Units (21)  
Nonvested at end of period, Units 1,255  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 50.86  
Granted, Weighted-Average Grant-Date Fair Value 46.88 $ 54.72
Vested, Weighted-Average Grant-Date Fair Value 48.33  
Forfeited, Weighted Average Grant Date Fair Value 51.00  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 49.99  
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 (28)  
Nonvested at end of period, Units 1,874  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 48.24  
Granted, Weighted-Average Grant-Date Fair Value 39.39 $ 39.53
Vested, Weighted-Average Grant-Date Fair Value 43.39  
Forfeited, Weighted Average Grant Date Fair Value 47.91  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 46.25