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Components of Convertible Notes (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 29, 2015 D | Jun. 29, 2014 D
2.625% Notes due 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of convertible debt conversion increments | $ 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember | [1] | $ 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember | [1]
Stock price percentage of conversion price | 130.00%lrcx_StockPricePercentageOfConversionPrice / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember |  | 130.00%lrcx_StockPricePercentageOfConversionPrice / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember |
Number of days on which common stock sale price was greater than or equal to 130% of conversion price, in a period of 30 consecutive trading days ending on the last trading day of the preceding the quarter | 20 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember |  | 20 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_ShortTermDebtTypeAxis = lrcx_TwoPointSixTwoFivePercentConvertibleSeniorNotesDueTwoThousandFortyOneMember |
Number of consecutive trading days period required | 30 days |  | 30 days |
0.50% Notes due 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of convertible debt conversion increments | 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_ZeroPointFiveZeroPercentConvertibleSeniorNotesDueTwoThousandSixteenMember |  | 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_ZeroPointFiveZeroPercentConvertibleSeniorNotesDueTwoThousandSixteenMember |
1.25% Notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of convertible debt conversion increments | $ 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_OnePointTwoFivePercentConvertibleSeniorNotesDueTwoThousandEighteenMember |  | $ 1,000 lrcx_NoteIncrementForWhichConversionAmountOfCommonStockIsBased / us-gaap_ShortTermDebtTypeAxis = lrcx_OnePointTwoFivePercentConvertibleSeniorNotesDueTwoThousandEighteenMember |
[1] | During the quarter-ended March 29, 2015 and June 29, 2014, the market value of the Company's Common Stock was greater than or equal to 130% of the 2041 Note conversion price for 20 or more trading days of the 30 consecutive trading days preceding the quarter end. As a result, the 2041 Notes are convertible at the option of the holder. The carrying amount of the 2041 Notes was classified in current liabilities and the excess of the amount of cash payable, if converted, over the carrying amount of the 2041 Notes was classified as temporary equity on the Company's Consolidated Balance Sheets as of March 29, 2015 and June 29, 2014. Upon closure of a conversion period, all 2041 Notes not converted will be reclassified back to noncurrent liabilities and the temporary equity will be reclassified to permanent equity.

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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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Balance Type: | credit
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- Definition Percentage by which Company's Common Stock trading value needs to exceed the underlying convertible debt instruments conversion price to meet a conversion trigger threshold. When said threshold is met for the requisite minimum number of trading days in said fiscal quarter, the underlying indentures may become convertible into common stock at the request of the bondholder. + References No definition available. + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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- Details
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- Details
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