Document And Entity Information - USD ($)	12 Months Ended
	Dec. 30, 2023	Feb. 12, 2024	Jul. 01, 2023
Document Information [Line Items]
Entity Central Index Key	0000855658
Entity Registrant Name	Lattice Semiconductor Corp
Amendment Flag	false
Current Fiscal Year End Date	--12-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 30, 2023
Document Transition Report	false
Entity File Number	000-18032
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-0835214
Entity Address, Address Line One	5555 NE Moore Court
Entity Address, City or Town	Hillsboro
Entity Address, State or Province	OR
Entity Address, Postal Zip Code	97124-6421
City Area Code	503
Local Phone Number	268-8000
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	LSCC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 10,394,183,650
Entity Common Stock, Shares Outstanding		137,550,564
Auditor Location	San Jose, California
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42