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Nature of Operations and Significant Accounting Policies (Details) (USD $)
 3 Months Ended 12 Months Ended
Jan. 03, 2015
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Jan. 02, 2016
Basis of Presentation and Significant Accounting Policies [Line Items]                        
Fiscal year duration                 371 days 364 days    
General Discussion of Derivative Instruments and Hedging Activities [Abstract]                        
Fair value adjustment through earnings on foreign exchange contracts not designated as hedges                 $ 400,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments $ 100,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments    
Risks and Uncertainties [Abstract]                        
Allowance for doubtful accounts 900,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent       900,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent       900,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 900,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Deferred Revenue and Credits [Abstract]                        
Inventory valued at published list price and held by sell-through distributors with right of return 50,854,000lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsInventoryValuedAtPublishedListPriceAndHeldBySellThroughDistributorsWithRightOfReturn       36,056,000lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsInventoryValuedAtPublishedListPriceAndHeldBySellThroughDistributorsWithRightOfReturn       50,854,000lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsInventoryValuedAtPublishedListPriceAndHeldBySellThroughDistributorsWithRightOfReturn 36,056,000lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsInventoryValuedAtPublishedListPriceAndHeldBySellThroughDistributorsWithRightOfReturn    
Allowance for distributor advances (29,490,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsAllowanceForDistributorAdvances       (24,090,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsAllowanceForDistributorAdvances       (29,490,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsAllowanceForDistributorAdvances (24,090,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsAllowanceForDistributorAdvances    
Deferred cost of sales related to inventory held by sell-through distributors (6,418,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsDeferredCostOfSalesOnInventoryHeldBySellThroughDistributors       (4,471,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsDeferredCostOfSalesOnInventoryHeldBySellThroughDistributors       (6,418,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsDeferredCostOfSalesOnInventoryHeldBySellThroughDistributors (4,471,000)lscc_DeferredIncomeAndAllowancesOnSalesToSellThroughDistributorsDeferredCostOfSalesOnInventoryHeldBySellThroughDistributors    
Total Deferred income and allowances on sales to sell-through distributors 14,946,000us-gaap_DeferredRevenueAndCreditsCurrent       7,495,000us-gaap_DeferredRevenueAndCreditsCurrent       14,946,000us-gaap_DeferredRevenueAndCreditsCurrent 7,495,000us-gaap_DeferredRevenueAndCreditsCurrent    
Resale of product by sell-through distributors as a percentage of total revenue                 45.00%us-gaap_ConcentrationRiskPercentage1 45.00%us-gaap_ConcentrationRiskPercentage1 55.00%us-gaap_ConcentrationRiskPercentage1  
Property, Plant and Equipment [Abstract]                        
Undistributed earnings of our Chinese subsidiary 3,300,000us-gaap_UndistributedEarningsOfForeignSubsidiaries               3,300,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Earnings Per Share [Abstract]                        
Net income (loss) 15,419,000us-gaap_NetIncomeLoss 9,406,000us-gaap_NetIncomeLoss 11,771,000us-gaap_NetIncomeLoss 11,984,000us-gaap_NetIncomeLoss 6,547,000us-gaap_NetIncomeLoss 8,844,000us-gaap_NetIncomeLoss 5,040,000us-gaap_NetIncomeLoss 1,890,000us-gaap_NetIncomeLoss 48,580,000us-gaap_NetIncomeLoss 22,321,000us-gaap_NetIncomeLoss (29,606,000)us-gaap_NetIncomeLoss  
Shares used in basic Net income (loss) per share                 117,708,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,701,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 117,194,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Dilutive effect of stock options, RSUs and ESPP shares                 2,537,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,380,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment  
Shares used in diluted Net income (loss) per share                 120,245,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 117,081,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 117,194,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Basic Net income (loss) per share $ 0.13us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ (0.25)us-gaap_EarningsPerShareBasic  
Diluted Net income (loss) per share $ 0.13us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.40us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ (0.25)us-gaap_EarningsPerShareDiluted  
Stock options, RSU's and ESPP shares                        
Earnings Per Share [Abstract]                        
Aggregate antidilutive shares excluded from computation of diluted net (loss) income per share                 2,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= lscc_StockOptionsRestrictedStockUnitsAndEmployeeStockPurchasePlanSharesMember		 7,800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= lscc_StockOptionsRestrictedStockUnitsAndEmployeeStockPurchasePlanSharesMember		 10,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= lscc_StockOptionsRestrictedStockUnitsAndEmployeeStockPurchasePlanSharesMember		  
Building                        
Property, Plant and Equipment [Abstract]                        
Estimated useful lives of PP&E                 30 years      
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]                        
Deferred Revenue and Credits [Abstract]                        
Resale of product by sell-through distributors as a percentage of total revenue                   22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		    
Sales Revenue | Sell-Through Distributors                        
Deferred Revenue and Credits [Abstract]                        
Resale of product by sell-through distributors as a percentage of total revenue                 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= lscc_SellThroughDistributorsMember		 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= lscc_SellThroughDistributorsMember		 55.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= lscc_SellThroughDistributorsMember		  
Minimum | Equipment and software                        
Property, Plant and Equipment [Abstract]                        
Estimated useful lives of PP&E                 3 years      
Minimum | Tooling                        
Property, Plant and Equipment [Abstract]                        
Estimated useful lives of PP&E                 1 year      
Maximum                        
General Discussion of Derivative Instruments and Hedging Activities [Abstract]                        
Fair value adjustment through earnings on foreign exchange contracts not designated as hedges                   500,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 500,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum | Equipment and software                        
Property, Plant and Equipment [Abstract]                        
Estimated useful lives of PP&E                 5 years      
Maximum | Tooling                        
Property, Plant and Equipment [Abstract]                        
Estimated useful lives of PP&E                 3 years      
Not designated as hedges for accounting purposes | Foreign exchange contracts                        
General Discussion of Derivative Instruments and Hedging Activities [Abstract]                        
Foreign exchange contracts outstanding $ 4,200,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		       $ 2,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		       $ 4,200,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 2,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		    
Next fiscal year - 2015                        
Basis of Presentation and Significant Accounting Policies [Line Items]                        
Fiscal year duration                       364 days
Customer A [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]                        
Deferred Revenue and Credits [Abstract]                        
Resale of product by sell-through distributors as a percentage of total revenue                 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= lscc_CustomerAMember		      
Customer B [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]                        
Deferred Revenue and Credits [Abstract]                        
Resale of product by sell-through distributors as a percentage of total revenue                 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= lscc_CustomerBMember