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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Goodwill [Roll Forward]      
Beginning balance $ 505,924 $ 467,420  
Purchase price allocation adjustments 1,504 101  
Goodwill from acquisition 10,087 38,403  
Ending balance 517,515 505,924  
Accumulated impairment losses (195,767) (195,767) $ (195,767)
Goodwill $ 321,748 $ 310,157 $ 271,653