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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2.4 | $ 0.8 | $ 0.6
Labor And Related Expense, Incentive Compensation | $ 7.9 | $ 5.8 | $ 5.9

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