Cover Page - shares	6 Months Ended
	Dec. 26, 2021	Jan. 28, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 26, 2021
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 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 Common Stock, Shares Outstanding		139,500,143
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000707549
Current Fiscal Year End Date	--06-26