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Goodwill and Intangible Assets - Future Amortization Expense For Intangible Assets (Details) - USD ($)
$ in Thousands
May. 01, 2016
Jan. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining nine months of fiscal year 2017 $ 19,239  
Fiscal year 2018 25,613  
Fiscal year 2019 22,201  
Fiscal year 2020 10,920  
Fiscal year 2021 3,089  
Thereafter 952  
Net carrying amount 82,014 $ 88,430
Core Technologies [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining nine months of fiscal year 2017 15,910  
Fiscal year 2018 21,213  
Fiscal year 2019 17,801  
Fiscal year 2020 9,970  
Fiscal year 2021 3,056  
Thereafter 952  
Net carrying amount 68,902 74,204
Customer Relationships [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining nine months of fiscal year 2017 3,300  
Fiscal year 2018 4,400  
Fiscal year 2019 4,400  
Fiscal year 2020 950  
Fiscal year 2021 33  
Thereafter 0  
Net carrying amount 13,083 14,183
Technology Licenses [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining nine months of fiscal year 2017 29  
Fiscal year 2018 0  
Fiscal year 2019 0  
Fiscal year 2020 0  
Fiscal year 2021 0  
Thereafter 0  
Net carrying amount [1] $ 29 $ 43
[1] Technology licenses relate to end-license agreements for intellectual property that is used by the Company in research and development activities and also has alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” in the condensed consolidated statements of operations.