v2.4.1.9

Contingencies (Details) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 29 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2014 | Dec. 04, 2014 integer | Jun. 23, 2010 integer | Jul. 31, 2006 integer | Nov. 29, 2012 | Mar. 10, 2014 integer
Qimonda AG Inotera Share Purchase Proceedings [Member] | Inotera [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, damages awarded, value | $ 1,000,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = mu_QimondaAgInoteraSharePurchaseProceedingsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mu_InoteraMember |  |  |  |  |
Equity method investment carrying value of shares acquired from Qimonda |  | 568,000,000 mu_EquityMethodInvestmentNetCarryingValueOfSharesSubjectToLitigation / us-gaap_LitigationCaseAxis = mu_QimondaAgInoteraSharePurchaseProceedingsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mu_InoteraMember |  |  |  |
Equity method investment quoted market value of shares acquired from Qimonda |  | 1,860,000,000 mu_EquityMethodInvestmentQuotedMarketValueOfSharesSubjecttoLitigation / us-gaap_LitigationCaseAxis = mu_QimondaAgInoteraSharePurchaseProceedingsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mu_InoteraMember |  |  |  |
Equity method investment approximate percentage of Inotera shares acquired from Qimonda |  | 55.00%mu_EquityMethodInvestmentSharesOwnedSubjecttoLitigation / us-gaap_LitigationCaseAxis = mu_QimondaAgInoteraSharePurchaseProceedingsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mu_InoteraMember |  |  |  |
Patent Matters [Member] | HSM Portfolio LLC and Technology Properties LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of other defendants |  | 17 us-gaap_LossContingencyNumberOfDefendants / us-gaap_LitigationCaseAxis = mu_HsmPortfolioLlcAndTechnologyPropertiesLlcMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Number of patents allegedly infringed |  | 4 us-gaap_LossContingencyPatentsAllegedlyInfringedNumber / us-gaap_LitigationCaseAxis = mu_HsmPortfolioLlcAndTechnologyPropertiesLlcMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Patent Matters [Member] | HSM Portfolio LLC and Technology Properties LLC [Member] | Elpida Memories, Inc. now known as Micron Memory Japan, Inc. [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of patents allegedly infringed |  | 2 us-gaap_LossContingencyPatentsAllegedlyInfringedNumber / dei_LegalEntityAxis = mu_ElpidaCompanyMember / us-gaap_LitigationCaseAxis = mu_HsmPortfolioLlcAndTechnologyPropertiesLlcMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Patent Matters [Member] | Board Of Trustees For The University Of Illinois [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of patents allegedly infringed |  | 3 us-gaap_LossContingencyPatentsAllegedlyInfringedNumber / us-gaap_LitigationCaseAxis = mu_BoardOfTrusteesForUniversityOfIllinoisMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Number of petitions submitted for inter-partes review |  | 3 mu_LossContingencyNumberOfPetitionsSubmittedForInterPartesReview / us-gaap_LitigationCaseAxis = mu_BoardOfTrusteesForUniversityOfIllinoisMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Number of patent claims found to be invalid by the Patent and Trademark Office |  |  |  |  |  | 3 mu_LossContingencyPatentsFoundInvalidNumber / us-gaap_LitigationCaseAxis = mu_BoardOfTrusteesForUniversityOfIllinoisMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember
Patent Matters [Member] | Semcon Tech, LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of patents allegedly infringed |  | 1 us-gaap_LossContingencyPatentsAllegedlyInfringedNumber / us-gaap_LitigationCaseAxis = mu_SemconTechLlcMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Patent Matters [Member] | Innovative Memory Solutions, Inc. [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of patents allegedly infringed |  | 8 us-gaap_LossContingencyPatentsAllegedlyInfringedNumber / us-gaap_LitigationCaseAxis = mu_InnovativeMemorySolutionsInc.Member / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_PatentMattersMember |  |  |  |
Antitrust Matters [Member] | DRAM Purported Class Action Price-fixing Lawsuit [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of lawsuits filed |  | 68 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = mu_DramPurportedClassActionPriceFixingLawsuitMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_AntitrustMattersMember |  |  |  |
Approximate number of U.S. states and territories filing suit |  |  |  | 40 mu_NumberOfUsStatesAndTerritoriesFilingSuit / us-gaap_LitigationCaseAxis = mu_DramPurportedClassActionPriceFixingLawsuitMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_AntitrustMattersMember |  |
Settlement agreement execution date |  | June 23, 2010 |  |  |  |
Settlement agreement amount |  |  | 67,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = mu_DramPurportedClassActionPriceFixingLawsuitMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_AntitrustMattersMember |  |  |
Settlement agreement number of installment payments |  |  | 3 mu_LossContingencySettlementAgreementNumberOfInstallmentPayments / us-gaap_LitigationCaseAxis = mu_DramPurportedClassActionPriceFixingLawsuitMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_AntitrustMattersMember |  |  |
Settlement agreement, number of years for installment payments (in years) |  | 2 years |  |  |  |
Amount paid into an escrow account in connection with settlement |  |  |  |  | $ 67,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = mu_DramPurportedClassActionPriceFixingLawsuitMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_AntitrustMattersMember |
Securities Matter [Member] | Former Shareholders of Elpida Memory, Inc [Member] | Elpida Memories, Inc. now known as Micron Memory Japan, Inc. [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs |  | 7 us-gaap_LossContingencyNumberOfPlaintiffs / dei_LegalEntityAxis = mu_ElpidaCompanyMember / us-gaap_LitigationCaseAxis = mu_FormerShareholdersofElpidaMemoryIncMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mu_SecuritiesMatterMember |  |  |  |

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- Definition Equity Method Investment Net Carrying Value Of Shares Subject to Litigation + References No definition available. + Details
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- Definition This item represents the aggregate value of each identified investment accounted for under the equity method of accounting subject to litigation based on the quoted market price for those investments in common stock for which a quoted market price is available. + References No definition available. + Details
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- Definition The approximate percentage of shares of an equity method investment owned by the entity which are currently subject to litigation. + References No definition available. + Details
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- Definition The number of petitions submitted to the Patent and Trademark Office for inter-partes review, challenging the validity of the patents in suit. + References No definition available. + Details
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- Definition The number of patents found to be invalid by the Patent and Trademark Office. + References No definition available. + Details
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- Definition The number of installment payments to be made upon final court approval of the class settlements. + References No definition available. + Details
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- Definition The number of year over which installment payments will be made upon final court approval of the class settlements. + References No definition available. + Details
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- Definition The number of U. S. states and territories whose Attorneys General filed suit. + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Number of defendants named in a legal action. + References No definition available. + Details
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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- Definition Number of another entity's patents that the entity has allegedly infringed. + References No definition available. + Details
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition The effective date of a duly executed litigation settlement agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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