2.4.0.81090 - Disclosure - Changes in Balance of Gross Unrecognized Tax Benefits (Detail)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$eol_PE5807----1310-K0007_STD_371_20130630_0http://www.sec.gov/CIK0000707549duration2012-06-25T00:00:002013-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$eol_PE5807----1310-K0007_STD_364_20120624_0http://www.sec.gov/CIK0000707549duration2011-06-27T00:00:002012-06-24T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$eol_PE5807----1310-K0007_STD_364_20110626_0http://www.sec.gov/CIK0000707549duration2010-06-28T00:00:002011-06-26T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3lrcx_ScheduleOfUnrecognizedTaxBenefitsLineItemslrcx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse02false 4us-gaap_UnrecognizedTaxBenefitsus-gaap_truecreditinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse343800000343.8USD$falsetruefalse2truefalsefalse181500000181.5USD$falsetruefalse3truefalsefalse190500000190.5USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false23false 4us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-3400000-3.4falsefalsefalse2truefalsefalse-200000-0.2falsefalsefalse3truefalsefalse-24200000-24.2falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false24false 4us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-51400000-51.4falsefalsefalse2truefalsefalse-6600000-6.6falsefalsefalse3truefalsefalse-5200000-5.2falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false25false 4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1130000011.3falsefalsefalse2truefalsefalse14000001.4falsefalsefalse3truefalsefalse1370000013.7falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false26false 4us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositionsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-11300000-11.3falsefalsefalse2truefalsefalse-4300000-4.3falsefalsefalse3truefalsefalse-13400000-13.4falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false27false 4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositionsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3520000035.2falsefalsefalse2truefalsefalse2230000022.3falsefalsefalse3truefalsefalse2010000020.1falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false28false 4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisitionus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse89000008.9falsefalsefalse2truefalsefalse149700000149.7falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of increase in unrecognized tax benefits resulting from acquisitions.No definition available.false29false 4us-gaap_UnrecognizedTaxBenefitsus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse333100000333.1USD$falsetruefalse2truefalsefalse343800000343.8USD$falsetruefalse3truefalsefalse181500000181.5USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 false2falseChanges in Balance of Gross Unrecognized Tax Benefits (Detail) (USD $)HundredThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.lamresearch.com/taxonomy/role/DisclosureChangesInBalanceOfGrossUnrecognizedTaxBenefits39