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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) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Oct. 27, 2013
Oct. 28, 2012
Time Lapse, EPS Performance And Strategic Performance Restricted Stock Units [Member]
   
Stock-based Compensation    
Nonvested at beginning of period, Units 4,208  
Granted, Units 1,615  
Vested, Units (2,525)  
Forfeited, Units (87)  
Nonvested at end of period, Units 3,211  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 34.05  
Granted, Weighted-Average Grant-Date Fair Value $ 39.72 $ 35.03
Vested, Weighted-Average Grant-Date Fair Value $ 33.18  
Forfeited, Weighted Average Grant Date Fair Value $ 35.13  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 37.56  
TSR Performance Restricted Stock/Units [Member]
   
Stock-based Compensation    
Nonvested at beginning of period, Units 1,458  
Granted, Units 458  
Vested, Units 0  
Forfeited, Units (931)  
Nonvested at end of period, Units 985  
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 41.88  
Granted, Weighted-Average Grant-Date Fair Value $ 36.26 $ 39.76
Vested, Weighted-Average Grant-Date Fair Value $ 0  
Forfeited, Weighted Average Grant Date Fair Value $ 43.08  
Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 38.15