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Goodwill and Intangible Assets - Future Amortization Expense For Intangible Assets (Details) - USD ($)
$ in Thousands
Jul. 31, 2016
Jan. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining six months of fiscal year 2017 $ 12,589  
Fiscal year 2018 25,144  
Fiscal year 2019 21,732  
Fiscal year 2020 10,855  
Fiscal year 2021 3,089  
Thereafter 953  
Net carrying amount 74,362 $ 88,430
Core Technologies [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining six months of fiscal year 2017 10,372  
Fiscal year 2018 20,744  
Fiscal year 2019 17,332  
Fiscal year 2020 9,905  
Fiscal year 2021 3,056  
Thereafter 953  
Net carrying amount 62,362 74,204
Customer Relationships [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining six months of fiscal year 2017 2,200  
Fiscal year 2018 4,400  
Fiscal year 2019 4,400  
Fiscal year 2020 950  
Fiscal year 2021 33  
Thereafter 0  
Net carrying amount 11,983 14,183
Technology Licenses [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining six months of fiscal year 2017 17  
Fiscal year 2018 0  
Fiscal year 2019 0  
Fiscal year 2020 0  
Fiscal year 2021 0  
Thereafter 0  
Net carrying amount [1] $ 17 $ 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” within the unaudited condensed consolidated statements of operations.