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Stock-based Compensation (Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units, Strategic Performance and Special Performance Restricted Stock Units And TSR Performance Restricted Stock Units) (Details) - $ / shares
shares in Thousands
9 Months Ended
Apr. 30, 2017
May 01, 2016
Time Lapse EPS, Strategic Performance and Special Performance Restricted Stock Units [Member]    
Stock-based Compensation    
Nonvested at beginning of period, Units 2,004  
Granted, Units 564  
Vested, Units (955)  
Forfeited, Units (355)  
Nonvested at end of period, Units 1,258  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 45.08  
Granted, Weighted-Average Grant-Date Fair Value 54.78 $ 50.28
Vested, Weighted-Average Grant-Date Fair Value 44.00  
Forfeited, Weighted Average Grant Date Fair Value 43.34  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 50.75  
TSR Performance Restricted Stock/Units [Member]    
Stock-based Compensation    
Nonvested at beginning of period, Units 1,641  
Granted, Units 606  
Vested, Units (251)  
Forfeited, Units (183)  
Nonvested at end of period, Units 1,813  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 49.13  
Granted, Weighted-Average Grant-Date Fair Value 39.53 $ 62.44
Vested, Weighted-Average Grant-Date Fair Value 36.26  
Forfeited, Weighted Average Grant Date Fair Value 43.84  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 48.24