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Financial Instruments - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 29, 2015
Mar. 30, 2014
Jun. 29, 2014
Financial Instruments [Line Items]          
Other than temporary impairment included in net realized gains (losses) $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount  
Gains realized from sales of investments 1,000,000us-gaap_GainOnSaleOfInvestments 400,000us-gaap_GainOnSaleOfInvestments 1,900,000us-gaap_GainOnSaleOfInvestments 800,000us-gaap_GainOnSaleOfInvestments  
Losses realized from sales of investments (400,000)us-gaap_LossOnSaleOfInvestments (700,000)us-gaap_LossOnSaleOfInvestments (1,400,000)us-gaap_LossOnSaleOfInvestments (1,700,000)us-gaap_LossOnSaleOfInvestments  
Investment classified as short term, contractual maturity period     1 year    
Gains (losses) accumulated in other comprehensive income expected to reclassify from other comprehensive income into earnings     (3,500,000)lrcx_EstimatedCashFlowHedgesGainLossToBeReclassifiedToEarnings    
Foreign exchange contracts gains (losses) accumulated in other comprehensive income expected to reclassify from other comprehensive income into earnings over the next 12 months (300,000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months   (300,000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months    
Gains (losses) accumulated in other comprehensive income expects to reclassify from other comprehensive income into earnings, interest rate contracts (3,200,000)lrcx_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext10Years   (3,200,000)lrcx_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext10Years    
Forward-starting interest rate swap agreements          
Financial Instruments [Line Items]          
Notional value 375,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
  375,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
   
Derivative Contracts | Cash flow hedging          
Financial Instruments [Line Items]          
Potential effect of rights of set-off under master netting agreements for derivative contracts assets 5,300,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  5,300,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  500,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Potential effect of rights of set-off under master netting agreements for derivative contracts liabilities 5,300,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  5,300,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  500,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Net derivative asset from master netting agreements 500,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  500,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  1,100,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Net derivative liabilities from master netting agreements $ 600,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  $ 600,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  $ 500,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_DerivativeContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Maximum          
Financial Instruments [Line Items]          
Foreign currency forward contract, expiration period     24 months    
Maximum | Majority of Contracts          
Financial Instruments [Line Items]          
Foreign currency forward contract, expiration period     12 months