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LONG-TERM DEBT AND OTHER BORROWINGS - Components of Convertible Notes (Phantom) (Detail) | Mar. 26, 2017 USD ($) $ / shares
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2018 Notes |
Debt Instrument [Line Items] |
Principal amount of convertible debt conversion increments | $ | $ 1,000
Average quarterly stock price (in dollars per share) | $ / shares | $ 116.02
2041 Notes |
Debt Instrument [Line Items] |
Principal amount of convertible debt conversion increments | $ | $ 1,000
Average quarterly stock price (in dollars per share) | $ / shares | $ 116.02

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- Definition Note Increment For Which Conversion Amount Of Common Stock Is Based + References No definition available. + Details
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Namespace Prefix: | lrcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=lrcx_OnePointTwoFivePercentConvertibleSeniorNotesDueTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |