Stock-Based Awards - Valuation of Stock Options and Restricted Share Units (Details) (USD $)	9 Months Ended
	Apr. 26, 2014
Stock Options
Stock Options, Shares
Outstanding beginning period	2,769,132
Granted	89,956
Options Exercised	(767,552)
Forfeited or cancelled	(5,949)
Outstanding ending period	2,085,587
Exercisable options beginning period	1,615,544
Stock Options, Weighted Average Exercise Price
Outstanding beginning period	$ 18.27
Granted	$ 27.50
Options Exercised	$ 18.25
Forfeited or cancelled	$ 22.86
Outstanding ending period	$ 18.66
Exercisable options beginning period	$ 18.77
Restricted Share Units (RSUs)
Restricted Stock, Share Units
Outstanding beginning period	463,318
Granted	94,456
Share Units Vested	(137,333)
Forfeited or cancelled	5,844
Outstanding ending period	414,597.000
Restricted Stock, Weighted Average Exercise Price
Outstanding beginning period	$ 17.78
Granted	$ 27.36
Share Units Vested	$ 16.19
Forfeited or cancelled	$ 19.26
Outstanding ending period	$ 20.47
Performance Restricted Share Units
Restricted Stock, Share Units
Outstanding beginning period	1,315,138
Granted	429,485
Share Units Vested	(265,025)
Forfeited or cancelled	281,995
Outstanding ending period	1,197,603.000
Restricted Stock, Weighted Average Exercise Price
Outstanding beginning period	$ 18.44
Granted	$ 27.66
Share Units Vested	$ 18.35
Forfeited or cancelled	$ 18.55
Outstanding ending period	$ 21.73