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Components of Other Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Component Of Other Expense Income Nonoperating [Line Items]
Interest income	$ 4,024us-gaap_InvestmentIncomeInterest	$ 2,828us-gaap_InvestmentIncomeInterest	$ 7,312us-gaap_InvestmentIncomeInterest	$ 5,551us-gaap_InvestmentIncomeInterest
Interest expense	(15,797)us-gaap_InterestExpense	(15,297)us-gaap_InterestExpense	(31,501)us-gaap_InterestExpense	(30,599)us-gaap_InterestExpense
Gains on deferred compensation plan related assets	2,593lrcx_GainOrLossOnAssetsRelatedToDeferredCompensationPlan	5,360lrcx_GainOrLossOnAssetsRelatedToDeferredCompensationPlan	5,009lrcx_GainOrLossOnAssetsRelatedToDeferredCompensationPlan	5,397lrcx_GainOrLossOnAssetsRelatedToDeferredCompensationPlan
Foreign exchange gains (losses)	(130)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	125us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	776us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(97)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other, net	(489)lrcx_OtherNonOperatingIncomeExpenseOtherNet	3,147lrcx_OtherNonOperatingIncomeExpenseOtherNet	2,957lrcx_OtherNonOperatingIncomeExpenseOtherNet	1,649lrcx_OtherNonOperatingIncomeExpenseOtherNet
Other income (expense), net	$ (9,799)us-gaap_OtherNonoperatingIncomeExpense	$ (3,837)us-gaap_OtherNonoperatingIncomeExpense	$ (15,447)us-gaap_OtherNonoperatingIncomeExpense	$ (18,099)us-gaap_OtherNonoperatingIncomeExpense

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- Definition

Amount of gain (loss) from the increase (decrease) in fair value of assets related to deferred compensation plan recognized in earnings.

+ References

No definition available.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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Amount of the cost of borrowed funds accounted for as interest expense.

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

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-Name Accounting Standards Codification

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

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

-Publisher SEC

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