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Stockholders' Equity (Employee and Director Stock Options, Restricted Stock and ESPP) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 12,802us-gaap_AllocatedShareBasedCompensationExpense $ 9,522us-gaap_AllocatedShareBasedCompensationExpense $ 7,510us-gaap_AllocatedShareBasedCompensationExpense  
2012 ESPP | ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
    3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
Percentage of employee's compensation maximum for employee share purchases 10.00%lscc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualContributionPerEmployeePercent
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
     
Purchase price of shares as percentage of fair market value 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
     
2012 ESPP | ESPP | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 300us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
200us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
100us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2012Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2007 ESPP | ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized       5,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2007Member
Purchase price of shares as percentage of fair market value 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2007Member
     
2007 ESPP | ESPP | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 100us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= lscc_EmployeeStockPurchasePlanEsppMember
/ us-gaap_PlanNameAxis
= lscc_EmployeeStockPurchasePlan2007Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember