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Schedule of Outstanding Foreign Currency Forward Contracts (Detail) (USD $)
Mar. 29, 2015
Buy Contracts  
Derivative [Line Items]  
Derivatives Designated as Hedging Instruments $ 32,149,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Derivatives Not Designated as Hedging Instruments 61,892,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Buy Contracts | Euro  
Derivative [Line Items]  
Derivatives Designated as Hedging Instruments 32,149,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Derivatives Not Designated as Hedging Instruments 1,804,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Buy Contracts | Korea (South), Won  
Derivative [Line Items]  
Derivatives Not Designated as Hedging Instruments 22,178,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_KRW
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Buy Contracts | Taiwan Dollar  
Derivative [Line Items]  
Derivatives Not Designated as Hedging Instruments 33,239,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_TWD
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Buy Contracts | Singapore Dollar  
Derivative [Line Items]  
Derivatives Not Designated as Hedging Instruments 4,671,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_SGD
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractOneMember
Sell Contracts  
Derivative [Line Items]  
Derivatives Designated as Hedging Instruments 59,529,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember
Derivatives Not Designated as Hedging Instruments 39,717,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember
Sell Contracts | Japanese Yen  
Derivative [Line Items]  
Derivatives Designated as Hedging Instruments 59,529,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= currency_JPY
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember
Derivatives Not Designated as Hedging Instruments 26,451,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_JPY
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember
Sell Contracts | Swiss Francs  
Derivative [Line Items]  
Derivatives Not Designated as Hedging Instruments 2,104,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_CHF
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember
Sell Contracts | Taiwan Dollar  
Derivative [Line Items]  
Derivatives Not Designated as Hedging Instruments $ 11,162,000lrcx_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractValue
/ us-gaap_DerivativeByNatureAxis
= currency_TWD
/ us-gaap_DerivativeInstrumentRiskAxis
= lrcx_ContractTwoMember