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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Goodwill [Roll Forward]      
Goodwill, gross, beginning balance $ 463,577 $ 370,616  
Goodwill acquisitions 1,278 92,961  
Goodwill, gross, ending balance 464,855 463,577  
Accumulated impairment losses (195,767) (195,767) (195,767)
Goodwill $ 269,088 $ 267,810 $ 174,849