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Fair Value of Financial Assets and Liabilities (Details) (USD $)
Jan. 25, 2015
Jan. 26, 2014
Financial assets and liabilities measured at fair value    
Convertible Debt, Fair Value Disclosures $ 1,679,600,000us-gaap_ConvertibleDebtFairValueDisclosures $ 1,528,400,000us-gaap_ConvertibleDebtFairValueDisclosures
Debt Instrument, Face Amount 1,500,000,000us-gaap_DebtInstrumentFaceAmount 1,500,000,000us-gaap_DebtInstrumentFaceAmount
Estimated Fair Value 4,421,395,000us-gaap_AvailableForSaleSecurities 4,092,648,000us-gaap_AvailableForSaleSecurities
US Government Agencies Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 750,320,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,013,327,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Cash and Cash Equivalents, Fair Value Disclosure 15,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Marketable Securities 735,300,000us-gaap_MarketableSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Corporate Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 2,186,311,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,763,725,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
Cash and Cash Equivalents, Fair Value Disclosure 147,200,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Marketable Securities 2,000,000,000us-gaap_MarketableSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Mortgage backed securities issued by United Sates government-sponsored enterprises    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 278,105,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 188,706,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Money Market Funds    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 132,495,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 307,865,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
US Treasury Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 536,364,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		 496,453,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
Asset-backed Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 452,884,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 257,717,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Fair Value, Inputs, Level 1 [Member]    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 132,495,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | Mortgage backed securities issued by United Sates government-sponsored enterprises    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | Money Market Funds    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 132,495,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]  
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 2 [Member]    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 4,288,900,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 750,320,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 2,186,311,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3]  
Fair Value, Inputs, Level 2 [Member] | Mortgage backed securities issued by United Sates government-sponsored enterprises    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 278,105,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]  
Fair Value, Inputs, Level 2 [Member] | Money Market Funds    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 536,364,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]  
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value 452,884,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]  
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities    
Financial assets and liabilities measured at fair value    
Estimated Fair Value $ 84,916,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]  
[1] Included in Cash Equivalents on the Consolidated Balance Sheet.
[2] Includes $15.0 million in Cash Equivalents and $735.3 million in Marketable Securities on the Consolidated Balance Sheet.
[3] Includes $147.2 million in Cash Equivalents and $2.0 billion in Marketable Securities on the Consolidated Balance Sheet.
[4] Included in Marketable Securities on the Consolidated Balance Sheet.