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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. 31, 2016
Aug. 02, 2015
Aug. 03, 2014
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 2,410    
Granted, Units 698    
Vested, Units (862)    
Forfeited, Units (242)    
Nonvested at end of period, Units 2,004 2,410  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 41.40    
Granted, Weighted-Average Grant-Date Fair Value 50.44 $ 43.00 $ 39.97
Vested, Weighted-Average Grant-Date Fair Value 39.50    
Forfeited, Weighted Average Grant Date Fair Value 43.73    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 45.08 $ 41.40  
TSR Performance Restricted Stock/Units [Member]      
Stock-based Compensation      
Nonvested at beginning of period, Units 1,579    
Granted, Units 682    
Vested, Units (438)    
Forfeited, Units (182)    
Nonvested at end of period, Units 1,641 1,579  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 40.75    
Granted, Weighted-Average Grant-Date Fair Value 62.44 $ 43.39 $ 36.26
Vested, Weighted-Average Grant-Date Fair Value 39.76    
Forfeited, Weighted Average Grant Date Fair Value 48.77    
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 49.13 $ 40.75