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Components of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 12, 2015
2.75% Notes due March 15, 2020
Debt Instrument [Line Items]
Carrying value, long-term	$ 497,200us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Unamortized discount	2,800us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Principal amount	500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember	500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Remaining amortization period (years)	5 years
Fair Value of Notes (Level 2)	503,160us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
3.80% Notes due March 15, 2025
Debt Instrument [Line Items]
Carrying value, long-term	496,553us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember
Unamortized discount	3,447us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember
Principal amount	500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember	500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember
Remaining amortization period (years)	10 years
Fair Value of Notes (Level 2)	$ 501,700us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

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- Definition

Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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