| Document and Entity Information | Sep. 11, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | LATTICE SEMICONDUCTOR CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000855658 |
| Document Type | 8-K |
| Document Period End Date | Sep. 11, 2023 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 000-18032 |
| 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 |
| City Area Code | (503) |
| Local Phone Number | 268-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $.01 par value |
| Trading Symbol | LSCC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
