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Goodwill and Intangible Assets - Future Amortization Expense For Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 28, 2013
Jan. 27, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 $ 15,264  
Fiscal year 2015 30,354  
Fiscal year 2016 29,797  
Fiscal year 2017 29,460  
Fiscal year 2018 28,341  
Thereafter 30,600  
Net carrying amount 163,816 174,358
Technology Licenses [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 843  
Fiscal year 2015 1,512  
Fiscal year 2016 1,501  
Fiscal year 2017 1,251  
Fiscal year 2018 842  
Thereafter 683  
Net carrying amount 6,632 [1] 7,108 [1]
Sierra Monolithics [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 4,434  
Fiscal year 2015 8,870  
Fiscal year 2016 8,870  
Fiscal year 2017 8,870  
Fiscal year 2018 8,160  
Thereafter 8,490  
Net carrying amount 47,694  
Gennum [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 9,483  
Fiscal year 2015 18,965  
Fiscal year 2016 18,419  
Fiscal year 2017 18,332  
Fiscal year 2018 18,332  
Thereafter 21,345  
Net carrying amount 104,876  
Cycleo [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 504  
Fiscal year 2015 1,007  
Fiscal year 2016 1,007  
Fiscal year 2017 1,007  
Fiscal year 2018 1,007  
Thereafter 82  
Net carrying amount $ 4,614  
[1] Technology licenses relate to licensing agreements entered into by the Company. Amortization expense related to technology licenses is reported as “Product development and engineering” in the unaudited consolidated condensed statements of income.