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Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Jun. 29, 2014
Goodwill And Intangible Assets [Line Items]
Gross intangible assets subject to amortization	$ 1,337,861us-gaap_FiniteLivedIntangibleAssetsGross	$ 1,327,063us-gaap_FiniteLivedIntangibleAssetsGross
Total gross intangible assets	1,346,961us-gaap_IntangibleAssetsGrossExcludingGoodwill	1,347,163us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization	(531,904)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(453,085)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net intangible assets subject to amortization	805,957us-gaap_FiniteLivedIntangibleAssetsNet	873,978us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets, net	815,057us-gaap_IntangibleAssetsNetExcludingGoodwill	894,078us-gaap_IntangibleAssetsNetExcludingGoodwill	[1]
Intangible assets not subject to amortization	9,100us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	20,100us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Customer Relationships
Goodwill And Intangible Assets [Line Items]
Gross intangible assets subject to amortization	615,484us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	615,618us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	(202,065)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(169,162)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net intangible assets subject to amortization	413,419us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	446,456us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Existing Technology
Goodwill And Intangible Assets [Line Items]
Gross intangible assets subject to amortization	654,633us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember	643,922us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember
Accumulated Amortization	(269,105)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember	(224,246)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember
Net intangible assets subject to amortization	385,528us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember	419,676us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_ExistingTechnologyMember
Patents
Goodwill And Intangible Assets [Line Items]
Gross intangible assets subject to amortization	32,053us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	32,253us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Accumulated Amortization	(25,420)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	(24,407)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Net intangible assets subject to amortization	6,633us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	7,846us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Other Intangible Assets
Goodwill And Intangible Assets [Line Items]
Gross intangible assets subject to amortization	35,691us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	35,270us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization	(35,314)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	(35,270)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Net intangible assets subject to amortization	377us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Development Rights
Goodwill And Intangible Assets [Line Items]
Intangible assets not subject to amortization	9,100us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember	9,100us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember
In Process Research And Development
Goodwill And Intangible Assets [Line Items]
Intangible assets not subject to amortization		$ 11,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = lrcx_InProcessResearchAndDevelopmentsMember
[1] Derived from audited financial statements

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