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Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2019
Aug. 15, 2019
Dec. 23, 2018
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2019    
Document Transition Report false    
Entity File Number 0-12933    
Entity Registrant Name LAM RESEARCH CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-2634797    
Entity Address, Address Line One 4650 Cushing Parkway,    
Entity Address, City or Town  Fremont,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94538    
City Area Code 510    
Local Phone Number 572-0200    
Title of 12(b) Security Common Stock, Par Value $0.001 Per Share    
Trading Symbol LRCX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 15,363,329,674
Entity Common Stock, Shares Outstanding   144,532,998  
Documents Incorporated by Reference
Parts of the Registrant’s Proxy Statement for the Annual Meeting of Stockholders expected to be held on or about November 5, 2019, are incorporated by reference into Part III of this Form 10-K. Except as expressly incorporated by reference herein, the Registrant’s proxy statement shall not be deemed to be part of this report.
   
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000707549    
Current Fiscal Year End Date --06-30