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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jan. 31, 2016
Jan. 25, 2015
Fiscal year 2017 $ 25,655  
Fiscal year 2018 25,613  
Fiscal year 2019 22,201  
Fiscal year 2020 10,920  
Fiscal year 2021 2,889  
Thereafter 1,151  
Net Carrying Amount 88,429 $ 97,600
Core technologies    
Fiscal year 2017 21,213  
Fiscal year 2018 21,213  
Fiscal year 2019 17,801  
Fiscal year 2020 9,970  
Fiscal year 2021 2,856  
Thereafter 1,151  
Net Carrying Amount 74,204 80,869
Customer relationships    
Fiscal year 2017 4,400  
Fiscal year 2018 4,400  
Fiscal year 2019 4,400  
Fiscal year 2020 950  
Fiscal year 2021 33  
Thereafter 0  
Net Carrying Amount 14,183 16,550
Technology licenses    
Fiscal year 2017 42  
Fiscal year 2018 0  
Fiscal year 2019 0  
Fiscal year 2020 0  
Fiscal year 2021 0  
Thereafter 0  
Net Carrying Amount [1] $ 42 $ 94
[1] Technology licenses relate to licensing agreements entered into by the Company that are used in research and development activities and have alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” in the consolidated statements of operations.