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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 26, 2014
Jan. 31, 2016
Jan. 25, 2015
Jan. 26, 2014
Goodwill and Intangible Assets [Line Items]        
Goodwill impairment   $ 0 $ 0 $ 116,686
Advanced Communications        
Goodwill and Intangible Assets [Line Items]        
Goodwill impairment $ 116,686      
In-process research and development | Income approach        
Goodwill and Intangible Assets [Line Items]        
Discount rate used to value IPR&D   12.00%    
Market participant tax rate used to value IPR&D   28.10%    
In-process research and development        
Goodwill and Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) $ 4,000 $ 0 $ 4,000 $ 4,000