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	12 Months Ended
	Jul. 28, 2013
Time Lapse E P S And Strategic Performance Restricted Stock Units [Member]
Stock-based Compensation
Nonvested at beginning of period, Units	3,951
Granted, Units	1,990
Vested, Units	(1,510)
Forfeited, Units	(223)
Nonvested at end of period, Units	4,208
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value	$ 33.19
Granted, Weighted-Average Grant-Date Fair Value	$ 35.44
Vested, Weighted-Average Grant-Date Fair Value	$ 33.74
Forfeited, Weighted Average Grant Date Fair Value	$ 33.70
Nonvested at end of period, Weighted-Average Grant-Date Fair Value	$ 34.05
TSR Performance Restricted Stock/Units [Member]
Stock-based Compensation
Nonvested at beginning of period, Units	2,143
Granted, Units	582
Vested, Units
Forfeited, Units	(1,267)
Nonvested at end of period, Units	1,458
Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value	$ 37.94
Granted, Weighted-Average Grant-Date Fair Value	$ 39.76
Vested, Weighted-Average Grant-Date Fair Value
Forfeited, Weighted Average Grant Date Fair Value	$ 34.25
Nonvested at end of period, Weighted-Average Grant-Date Fair Value	$ 41.88