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Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 169,048us-gaap_FiniteLivedIntangibleAssetsGross $ 185,997us-gaap_FiniteLivedIntangibleAssetsGross $ 228,618us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (71,448)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (49,053)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Net Carrying Amount 97,600us-gaap_FiniteLivedIntangibleAssetsNet 136,944us-gaap_FiniteLivedIntangibleAssetsNet  
Core technologies      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 134,155us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 146,925us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		  
Accumulated Amortization (53,286)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 (35,357)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		  
Net Carrying Amount 80,869us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 111,568us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		  
Core technologies | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 6 years    
Core technologies | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 8 years    
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 28,030us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 28,630us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		  
Accumulated Amortization (11,480)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 (7,505)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		  
Net Carrying Amount 16,550us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 21,125us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		  
Customer relationships | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 7 years    
Customer relationships | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 10 years    
Technology licenses      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 2 years    
Gross Carrying Amount 263us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1] 3,842us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1]  
Accumulated Amortization (169)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1] (367)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1]  
Net Carrying Amount 94us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1] 3,475us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [1]  
Other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 6,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 6,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		  
Accumulated Amortization (6,513)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 (5,824)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		  
Net Carrying Amount 87us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 $ 776us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		  
Other intangible assets | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 1 year    
Other intangible assets | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 5 years    
[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.