Stock-Based Awards - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 25, 2015
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Remaining Contractual Life (In years), Outstanding	6 years
Weighted Average Remaining Contractual Life (In years), Exercisable options	5 years 1 month
Aggregate Intrinsic Value, Outstanding	$ 43,052
Aggregate Intrinsic Value, Exercisable options	$ 33,139
Stock Options
Stock Options, Outstanding [Roll Forward]
Outstanding as of	2,044,893
Granted	90,686
Options exercised	(735,330)
Forfeited or canceled	(484,926)
Outstanding as of	915,323
Exercisable options	657,055
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding as of	$ 18.68
Granted	31.46
Options exercised	12.13
Forfeited or canceled	34.44
Outstanding as of	16.86
Exercisable options	$ 13.46