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v2.4.1.9

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 | $ 497,200 us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember |
Unamortized discount | 2,800 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember |
Principal amount | 500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember | 500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Remaining amortization period (years) | 5 years |
Fair Value of Notes (Level 2) | 503,160 us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember |
3.80% Notes due March 15, 2025 |  |
Debt Instrument [Line Items] |  |
Carrying value, long-term | 496,553 us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember |
Unamortized discount | 3,447 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember |
Principal amount | 500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember | 500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember
Remaining amortization period (years) | 10 years |
Fair Value of Notes (Level 2) | $ 501,700 us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember |

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- 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 -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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