Stock-Based Awards - Tax Benefit Recognized (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 3,544	$ 2,496	$ 7,049	$ 4,762
Tax (benefit) recognized in the statement of operations	$ (1,368)	$ (1,063)	$ (2,665)	$ (1,827)