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Goodwill and Intangible Assets - Future Amortization Expense For Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 28, 2013
Jan. 27, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 $ 22,826  
Fiscal year 2015 30,307  
Fiscal year 2016 29,732  
Fiscal year 2017 29,395  
Fiscal year 2018 28,275  
Thereafter 30,655  
Net carrying amount 171,190 174,358
Technology Licenses [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 1,194  
Fiscal year 2015 1,465  
Fiscal year 2016 1,436  
Fiscal year 2017 1,186  
Fiscal year 2018 776  
Thereafter 738  
Net carrying amount 6,795 [1] 7,108 [1]
Sierra Monolithics [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 6,652  
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 49,912  
Gennum [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 14,224  
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 109,617  
Cycleo [Member]
   
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal year 2014 756  
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 $ 4,866  
[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.