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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 3.1 | $ 2.8 | $ 2.6
Labor And Related Expense, Incentive Compensation | $ 15.0 | $ 25.2 | $ 18.0

X
- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References No definition available. + Details
Name: | lscc_LaborAndRelatedExpenseIncentiveCompensation
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration