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v3.19.3.a.u2

Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Retirement Benefits [Abstract] |  |  |
Employer matching contribution to a 401(k) plan | $ 0.8 | $ 0.6 | $ 0.8
Cash incentive plan expense | $ 5.8 | $ 5.9 | $ 7.2

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- Definition Labor and Related Expense, Incentive Compensation + References No definition available. + Details
Name: | lscc_LaborAndRelatedExpenseIncentiveCompensation
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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