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Goodwill and Intangible Assets - Annual Impairment Analyses (Details)
 12 Months Ended
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Finite-Lived Intangible Assets [Line Items]      
Change in discount rate, with all other variable held constant, for impairment testing 1.00%    
Goodwill      
Finite-Lived Intangible Assets [Line Items]      
Discount Rate 11.50% 11.50% 11.50%
Goodwill | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Terminal Growth Rate 1.50% 1.50% 1.50%
Goodwill | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Terminal Growth Rate 2.50% 3.00% 2.50%