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Schedule of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Jun. 29, 2014
Goodwill And Intangible Assets [Line Items]    
Gross intangible assets subject to amortization $ 1,339,006us-gaap_FiniteLivedIntangibleAssetsGross $ 1,327,063us-gaap_FiniteLivedIntangibleAssetsGross
Total gross intangible assets 1,348,106us-gaap_IntangibleAssetsGrossExcludingGoodwill 1,347,163us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization (571,448)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (453,085)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net intangible assets subject to amortization 767,558us-gaap_FiniteLivedIntangibleAssetsNet 873,978us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets, net 776,658us-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 615,377us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 615,618us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (218,505)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 396,872us-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 654,385us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lrcx_ExistingTechnologyMember		 643,922us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lrcx_ExistingTechnologyMember
Accumulated Amortization (291,705)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lrcx_ExistingTechnologyMember		 (224,246)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lrcx_ExistingTechnologyMember
Net intangible assets subject to amortization 362,680us-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 33,553us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 32,253us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Accumulated Amortization (25,899)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 7,654us-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 (35,339)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 352us-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