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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Compensation Related Costs [Abstract]    
Employer matching contribution to a 401(k) plan $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0.8us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
2013 Plan    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Charge related to incentive compensation   11.3lscc_LaborAndRelatedExpenseIncentiveCompensation
/ us-gaap_PlanNameAxis
= lscc_A2013CashPlanMember
2014 Plan    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Charge related to incentive compensation $ 11.6lscc_LaborAndRelatedExpenseIncentiveCompensation
/ us-gaap_PlanNameAxis
= lscc_A2014CashPlanMember