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Segment and Geographic Information (Revenue by Primary Distributor) (Details)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Revenue, Major Customer [Line Items]      
Revenue from all sell-through distributors 45.00%us-gaap_ConcentrationRiskPercentage1 45.00%us-gaap_ConcentrationRiskPercentage1 55.00%us-gaap_ConcentrationRiskPercentage1
Arrow Electronics Inc. (including Nu Horizons Electronics)      
Revenue, Major Customer [Line Items]      
Revenue from all sell-through distributors 24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NuHorizonsElectronicsCorpMember
23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NuHorizonsElectronicsCorpMember
28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NuHorizonsElectronicsCorpMember
Weikeng Group      
Revenue, Major Customer [Line Items]      
Revenue from all sell-through distributors 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_WeikengGroupMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_WeikengGroupMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_WeikengGroupMember
All others      
Revenue, Major Customer [Line Items]      
Revenue from all sell-through distributors 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NameOfMajorCustomerAllOthersMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NameOfMajorCustomerAllOthersMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= lscc_NameOfMajorCustomerAllOthersMember