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Equity Based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Dec. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options and restricted stock units vesting period, years 3 years
Novellus Systems Incorporated  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options and restricted stock units vesting period, years 4 years
Employee Stock Purchase Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average remaining period for recognition, years 8 months
ESPP purchase price per share as percentage of fair market value 85.00%lrcx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfMarketPrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Unrecognized compensation expense 9.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense, stock option 2.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average remaining period for recognition, years 1 year 7 months 6 days
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average remaining period for recognition, years 1 year 8 months 12 days
Unrecognized compensation expense 135.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember