Cover Page - USD ($)	12 Months Ended
	Jun. 26, 2022	Aug. 22, 2022	Dec. 26, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 26, 2022
Current Fiscal Year End Date	--06-26
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 77,032,123,135
Entity Common Stock, Shares Outstanding		136,987,792
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 8, 2022, 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	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000707549