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Agreement with SK hynix (Details 2) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 11, 2013
Dec. 09, 2013
SK hynix    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Antitrust litigation settlement $ 4.0rmbs_SettlementAgreementEstimatedFairValueAntitrustLitigationSettlement
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember		  
Settlement of past infringement 280.0rmbs_SettlementAgreementEstimatedFairValueSettlementOfPastInfringement
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember		  
License Agreement 250.0rmbs_SettlementAgreementEstimatedFairValueLicenseAgreement
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember		  
Total fair value 534.0rmbs_SettlementAgreementEstimatedFairValueTotal
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember		  
Micron    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Antitrust litigation settlement   8.0rmbs_SettlementAgreementEstimatedFairValueAntitrustLitigationSettlement
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember
Settlement of past infringement   235.0rmbs_SettlementAgreementEstimatedFairValueSettlementOfPastInfringement
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember
License Agreement   440.0rmbs_SettlementAgreementEstimatedFairValueLicenseAgreement
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember
Total fair value   $ 683.0rmbs_SettlementAgreementEstimatedFairValueTotal
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember