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Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	$ 5,556us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Reclassified to Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	4,856us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = lrcx_ReclassifiedToRevenueMember
Reclassified to cost of goods sold
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	(1,590)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = lrcx_ReclassifiedToCostOfGoodsSoldMember
Reclassified to selling, general, and administrative
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	$ (542)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = lrcx_ReclassifiedToSellingGeneralAndAdministrativeMember

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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