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

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- Definition Represents the portion of the aggregate settlement agreement estimated fair value allocated to the antitrust litigation settlement. + References No definition available. + Details
Name: | rmbs_SettlementAgreementEstimatedFairValueAntitrustLitigationSettlement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the portion of the aggregate settlement agreement estimated fair value allocated to the license agreement. + References No definition available. + Details
Name: | rmbs_SettlementAgreementEstimatedFairValueLicenseAgreement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the portion of the aggregate settlement agreement estimated fair value allocated to past infringement. + References No definition available. + Details
Name: | rmbs_SettlementAgreementEstimatedFairValueSettlementOfPastInfringement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the estimated fair value of the settlement agreement which Samsung has agreed to pay subject to adjustments per the terms of the License Agreement. + References No definition available. + Details
Name: | rmbs_SettlementAgreementEstimatedFairValueTotal
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rmbs_AgreementNameAxis=rmbs_MicronAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rmbs_AgreementNameAxis=rmbs_SKHynixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |