Document And Entity Information
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 1 - Basis of Presentation and Significant Accounting Policies
Note 2 - Net Income Per Share
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Weighted average risk-free interest rate
Note 3 - Revenue From Contracts With Customers
Note 4 - Balance Sheet Components
Note 5 - Property and Equipment
Note 6 - Intangible Assets and Goodwill
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
Weighted average expected volatility
Note 7 - Long-term Debt
Note 8 - Restructuring
Income Tax Disclosure [Text Block]
Note 9 - Leases
Note 10 - Stock-based Compensation Plans
Note 12 - Income Taxes
Note 15 - Segment Reporting
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 1 - Basis of Presentation and Significant Accounting Policies - Concentration of Risk By Risk (Details)
Note 2 - Net Income Per Share - Earnings Per Share (Details)
Note 3 - Revenue From Contracts with Customers - Disaggregation of Revenue (Details)
Note 3 - Revenue From Contracts With Customers - Contract Balance (Details)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Expected term (years) (Year)
Note 4 - Balance Sheet Components - Accounts Receivable (Details)
Note 4 - Balance Sheet Components - Inventories (Details)
Note 4 - Balance Sheet Components - Accrued Liabilities (Details)
Note 4 - Balance Sheet Components - Accrued Liabilities (Details) (Parentheticals)
Impairment of right-of use asset during the period (recorded in Restructuring charges)
Represents the impairment of the operating lease right-of-use asset.
Note 4 - Balance Sheet Components - Other Long-Term Liabilities (Details)
us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Change in actuarial valuation of defined benefit pension, net of tax
Note 5 - Property and Equipment - Property, Plant and Equipment (Details)
Note 6 - Intangible Assets and Goodwill - Finite Lived Intangible Assets (Details)
Weighted Average Amortization (Year)
Note 6 - Intangible Assets and Goodwill - Amortization Expense (Details)
Note 6 - Intangible Assets and Goodwill - Finite Lived Intangible Assets Future Amortization Expense (Details)
Note 7 - Long-term Debt - Interest Expense (Details)
Note 8 - Restructuring - Activity Related to Restructuring Plans (Details)
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Note 9 - Leases - Lease Balance Classifications Within the Consolidated Balance Sheets and Lease Activity (Details)
Note 9 - Leases - Maturities of Operating Lease Liabilities (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)
Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Translation adjustment
Note 10 - Stock-based Compensation Plans - Stock-based Compensation (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Vested, weighted average grant date fair value (in dollars per share)
Note 10 - Stock-Based Compensation Plans - Share-based Payment Award Stock Options Valuation Assumptions (Details)
Note 10 - Stock-Based Compensation Plans - Schedule of Share Based Compensation Stock Options Activity (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Forfeited or expired, weighted average grant date fair value (in dollars per share)
Note 10 - Stock-Based Compensation Plans - Schedule of Nonvested Restricted Stock Units Activity (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Balance, weighted average grant date fair value (in dollars per share)
Balance, weighted average grant date fair value (in dollars per share)
Note 10 - Stock-Based Compensation Plans - Assumptions Used at Grant Date In the Valuation of RUSs (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited or expired (in shares)
Note 10 - Stock-based Compensation Plans - Share Based Compensation Performance Shares Award Market Condition or Performance Condition (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Balance (in shares)
Balance (in shares)
Note 12 - Income Taxes - Income Before Income Tax Domestic and Foreign (Details)
Note 12 - Income Taxes - Components of Income Tax Expense Benefit (Details)
Note 12 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Granted (in shares)
Note 12 - Income Taxes - Valuation Allowance (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested (in shares)
Note 12 - Income Taxes - Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward (Details)
Note 15 - Segment Reporting - Segment Reporting (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Exercisable (in shares)
Notes To Financial Statements
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Exercisable, weighted average exercise price (in dollars per share)
Notes To Financial Statements [Abstract]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Exercisable, intrinsic Value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Vested and expected to vest (in shares)
Licensed Technology [Member]
Represents information pertaining to licensed technology.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Vested and expected to vest, weighted average exercise price (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Vested and expected to vest, intrinsic Value
The 2022 Credit Agreement [Member[
Represents information pertaining to the 2022 Credit Agreement.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Balance, weighted average exercise price (in dollars per share)
Balance, weighted average exercise price (in dollars per share)
Contract liabilities
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Forfeited or expired, weighted average exercise price (in dollars per share)
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Granted, weighted average exercise price (in dollars per share)
Foreign, VAT, and other taxes payable
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Exercised, weighted average exercise price (in dollars per share)
Accrued liabilities
Accrued Liabilities, Current
Total accrued liabilities
us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued payroll obligations
Lessee, Operating Leases [Text Block]
us-gaap_AccountsPayableCurrent
Accounts payable
Revolving Credit Facility [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Balance (in shares)
Balance (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Forfeited or expired (in shares)
Accrued purchases of plant and equipment
Credit Facility [Axis]
Charge for expiring production materials
Credit Facility [Domain]
Other accrued liabilities
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Trademarks and Trade Names [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent
Action in Oregon in Connection with Sale of Certain Products [Member]
Related to Action in Oregon in Connection with Sale of Certain Products.
us-gaap_PaymentsToAcquireIntangibleAssets
Cash paid for software and intellectual property licenses
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)
Income taxes paid, net of refunds
Share-Based Payment Arrangement, Tranche Three [Member]
Liabilities, Current [Abstract]
Supplemental Balance Sheet Disclosures [Text Block]
Shares used in per share calculations:
Vesting [Axis]
Treasury Stock [Text Block]
Vesting [Domain]
Operating lease liabilities, current and long-term portions
Share-Based Payment Arrangement, Tranche One [Member]
Supplemental disclosure of cash flow information and non-cash investing and financing activities:
Product [Member]
Share-Based Payment Arrangement, Tranche Two [Member]
us-gaap_Assets
Total assets
Impairment of operating lease right-of-use asset
Plan Name [Axis]
Plan Name [Domain]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Compensation and Employee Benefit Plans [Text Block]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Accretion of lease liabilities
Customer Relationships [Member]
The2012 ESPP [Member]
Represents information pertaining to the 2012 ESPP Plan
us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-Based Payment Arrangement, Expense, Tax Benefit
The 2013 Incentive Plan [Member]
Represents information pertaining to the 2013 incentive plan.
us-gaap_LossContingencyDamagesSoughtValue
Loss Contingency, Damages Sought, Value
Deferred income taxes
Deferred tax assets
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumAnnualContributionPerEmployeePercent
Share-based Compensation Arrangement By Share-based Payment Award, Maximum, Annual Contribution Per Employee, Percent
The maximum annual contribution percentage per employee that can be used under the plan.
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
us-gaap_ContractWithCustomerAssetNet
Contract assets, balance
Contract assets, balance
Award Type [Domain]
TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member]
Information pertaining to TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile.
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Award Type [Axis]
Net income
Net income
Net income
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization
Intangible Assets, net
Total
Intangible assets, net
Restricted Stock Units (RSUs) [Member]
Intangible Assets, gross
Restricted Stock [Member]
Performance Shares [Member]
Share-Based Payment Arrangement, Option [Member]
us-gaap_InterestExpenseDebtExcludingAmortization
Contractual interest
lscc_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfAssociatedIncomeTaxPenaltiesAndInterestAccrued
Significant Change in Unrecognized Tax Benefits Is Reasonably Possible, Amount of Associated Income, Tax Penalties and Interest Accrued
The amount of interest and penalties of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.
Accumulated depreciation
Accumulated depreciation and amortization
Total property and equipment, net
Property and equipment, less accumulated depreciation of $125,901 at December 28, 2024 and $125,856 at December 30, 2023
Goodwill
Goodwill
Contingencies Disclosure [Text Block]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsVestedInPeriodNumberOfShares
Vested, Shares (in shares)
Number of vested options and non-option equity instruments.
Repurchase Program 2025 [Member]
Represents information pertaining to Repurchase Program 2025.
us-gaap_PropertyPlantAndEquipmentGross
Property and Equipment
Depreciation and amortization
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets, excluding amortization of right of use assets and finance costs. .
Existing Technology [Member]
Represents existing technology.
Masks [Member]
Represents masks.
Write-off of non-recoverable cost-method investment
Cash flows from investing activities:
Net income per share:
Earnings Per Share [Text Block]
The 2023 Equity Incentive Plan and the 2011 Non-Employee Director Equity Incentive Plan [Member]
Represents 2023 Equity Incentive Plan and the 2011 Non-Employee Director Equity Incentive Plan.
us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued payroll obligations
us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued liabilities
Income tax (benefit) expense
Income tax (benefit) expense
CHINA
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsForfeituresWeightedAverageGrantDateFairValue
Canceled, Weighted average grant date fair value (in dollars per share)
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
Awards Granted in 2022 and 2021 [Member]
Information pertaining to awards granted in prior years.
Total operating expenses
Total operating expenses
U.S. tax on foreign operations
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to U.S. tax on foreign operations, percent.
Capital loss expiration
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to capital loss expiration percentage.
us-gaap_DebtInstrumentTerm
Debt Instrument, Term (Year)
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
Cash and cash equivalents
us-gaap_AllocatedShareBasedCompensationExpense
Share-Based Payment Arrangement, Expense
Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Tabular disclosure of the significant assumptions of stock options and employee stock purchase plans used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
Amendment Flag
Total comprehensive income
Total comprehensive income
Comprehensive income
City Area Code
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
Change in noncurrent taxes payable
Common stock, shares outstanding (in shares)
Balances (in shares)
Balances (in shares)
Preferred stock, shares outstanding (in shares)
Employee Stock Purchase Plan [Member]
Information pertaining to the Employee Stock Purchase Plan.
Share-Based Payment Arrangement, Tranche Five [Member]
Fifth portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.
Share-Based Payment Arrangement, Tranche Six [Member]
Sixth portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.
Current Fiscal Year End Date
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
JAPAN
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating Lease, Weighted Average Discount Rate, Percent
Fiscal Period, Policy [Policy Text Block]
Document Fiscal Period Focus
us-gaap_OperatingLeaseCost
Operating Lease, Cost
Document Fiscal Year Focus
Document Period End Date
Operating lease right-of-use assets obtained in exchange for lease obligations
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating Lease, Weighted Average Remaining Lease Term (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Entity Small Business
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
Entity Public Float
Entity Filer Category
Debt Instrument [Axis]
Entity Current Reporting Status
Debt Instrument, Name [Domain]
Restructuring
Restructuring Charges
Entity Voluntary Filers
Acquisition related
Entity Well-known Seasoned Issuer
Impairment of acquired intangible assets
us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Impairment of Intangible Assets, Finite-Lived
Impairment
Variable Rate [Domain]
Federal tax credits
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to federal tax credit
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
Variable Rate [Axis]
Revenue Percentage
Concentration Risk, Percentage
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable, net
Stock-based compensation expense
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
Entity Registrant Name
lscc_SharebasedPaymentArrangementBenefitFromForfeitures
Share-Based Payment Arrangement, Benefit From Forfeitures
The amount of benefit from forfeitures under share-based payment arrangement.
Entity [Domain]
Customer Concentration Risk [Member]
Legal Entity [Axis]
Entity Address, Address Line One
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Amortization of intangible assets
Entity Address, City or Town
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Entity Address, Postal Zip Code
Entity Address, State or Province
Concentration Risk Type [Axis]
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Concentration Risk Type [Domain]
Material Terms of Trading Arrangement [Text Block]
ecd_TrdArrIndTitle
Trading Arrangement, Individual Title
Other Asia [Member]
Information pertaining to other Asia.
ecd_TrdArrIndName
Trading Arrangement, Individual Name
ecd_TrdArrTerminationDate
Trading Arrangement Termination Date
ecd_TrdArrSecuritiesAggAvailAmt
Trading Arrangement, Securities Aggregate Available Amount
lscc_PercentageOfRevenue
Percentage of revenue
Represents the percentage of revenue.
Entity Common Stock, Shares Outstanding
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock Repurchased and Retired During Period, Value
Repurchase of common stock
us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Stock Repurchased and Retired During Period, Shares (in shares)
Repurchase of common stock (in shares)
PHILIPPINES
ecd_TrdArrAdoptionDate
Trading Arrangement Adoption Date
Revenue Benchmark [Member]
Accounts Receivable [Member]
Long-Term Debt [Text Block]
us-gaap_IncreaseDecreaseInInventories
Inventories, net
Trading Symbol
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Local Phone Number
us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Line of Credit Facility, Commitment Fee Percentage
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercised (in shares)
us-gaap_TableTextBlock
Notes Tables
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Q32024 Plan 1Member
Represents Q3 2024 Plan.
Long-term portion of liability for non-cancelable contracts
Amount of liability for non-cancelable contracts, classified as noncurrent.
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)
Selling, general, and administrative
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Granted (in shares)
lscc_LaborAndRelatedExpenseIncentiveCompensation
Labor And Related Expense, Incentive Compensation
Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.
TAIWAN
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageBasedOnSockPriceAppreciation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Sock Price Appreciation
Percentage of vesting of award under share-based payment arrangement based on stock price appreciation.
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
Finished goods
Work in progress
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardPercentageAwardVestingRights
Share-based Compensation Arrangement by Share-based Payment Award, Percentage, Award Vesting Rights
Percentage of vesting of award under share-based payment arrangement.
UNITED STATES
Retained earnings
Research and development
Accumulated other comprehensive loss
Q3 2023 Plan [Member]
Represents Q3 2023 Plan.
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedNumberOfShares
Balance, Shares (in shares)
Balance, Shares (in shares)
Number of non-vested options and non-option equity instruments outstanding.
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedGrantsInPeriodGross
Granted, Shares (in shares)
Gross number of nonvested share options and non-option equity instruments (or share units) granted during the period.
lscc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedEffectOfVestingMultiplier
Effect of vesting multiplier, Shares (in shares)
The number of shares awarded and vested due to the effect of the vesting multiplier during the period on stock (or unit) option and non-option instrument plans.
Canceled, Shares (in shares)
Number of non-vested options and non-option equity instruments forfeited.
us-gaap_InterestExpenseDebt
Total interest expense related to long-term debt
Changes in assets and liabilities:
us-gaap_AmortizationOfFinancingCosts
Amortization of original issuance discount and debt costs
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_OtherNoncashIncomeExpense
Other non-cash adjustments
Long-term operating lease liabilities, net of current portion
Schedule of Inventory, Current [Table Text Block]
us-gaap_OperatingLeaseLiability
Total lease liabilities
Balance
Balance
Current portion of operating lease liabilities
Less: Current portion of operating lease liabilities (included in Accrued liabilities)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Operating lease right-of-use assets
Balance
Balance
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less: amount representing interest
Change in deferred income tax provision
Deferred Income Tax Expense (Benefit)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2027
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2029
2026
2027
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2025
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2026
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
us-gaap_PaymentsForRestructuring
Costs paid or otherwise settled
2025
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Other long-term assets
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Lessee, Leases [Policy Text Block]
Business Combinations Policy [Policy Text Block]
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]
Tabular disclosure of the significant assumptions of restricted stock units used during the year to estimate the fair value of restricted stock units, including, but not limited to: (a) expected term of restricted stock units and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
Operating expenses:
Income Tax, Policy [Policy Text Block]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
us-gaap_LesseeOperatingLeaseTermOfContract
Lessee, Operating Lease, Term of Contract (Year)
Research and Development Expense, Policy [Policy Text Block]
us-gaap_Depreciation
Depreciation
lscc_LesseeOperatingLeaseOptionToExtendPeriod
Lessee, Operating Lease, Option to Extend, Period (Year)
Represents option to extend period for operating lease.
lscc_LesseeOperatingLeaseOptionToTerminatePeriod
Lessee, Operating Lease, Option to Terminate Period (Year)
Represents option to terminate period for operating lease of lessee.
Costs Associated with Exit or Disposal Activity or Restructuring [Policy Text Block]
Intangible Assets Disclosure [Text Block]
us-gaap_AssetsCurrent
Total current assets
Share-Based Payment Arrangement [Policy Text Block]
Common stock, $.01 par value, 300,000,000 shares authorized; 137,704,000 shares issued and outstanding as of December 28, 2024 and 137,340,000 shares issued and outstanding as of December 30, 2023
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Common stock, shares authorized (in shares)
Americas [Member]
Awards with Market Condition or Performance Condition [Member]
Represents the the awards with a market condition or a performance condition.
Common stock, shares issued (in shares)
Distributors [Member]
Represents the distributors of the company.
Common stock, par value per share (in dollars per share)
Asia [Member]
Revenue from Contract with Customer [Policy Text Block]
us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Valuation Allowance
Less: valuation allowance
Statistical Measurement [Domain]
Operating lease payments
Operating cash used for payments on lease liabilities
Maximum [Member]
Summary of Valuation Allowance [Table Text Block]
Minimum [Member]
Product and Service [Axis]
us-gaap_DeferredTaxAssetsNet
Net deferred tax assets
Product and Service [Domain]
Statistical Measurement [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued and outstanding
Net deferred taxes
Net deferred taxes
Preferred stock, shares issued (in shares)
Interest paid
us-gaap_DeferredTaxAssetsOther
Other
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]
Property, Plant and Equipment Disclosure [Text Block]
Geographical [Axis]
Property, Plant and Equipment [Table Text Block]
Geographical [Domain]
us-gaap_DeferredTaxAssetsGross
Total deferred tax assets
Preferred stock, shares authorized (in shares)
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
Deferred tax liabilities (included in Other long-term liabilities)
Europe [Member]
Inventories, net
Total inventories, net
Preferred stock, par value per share (in dollars per share)
Customer [Axis]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsNonvestedWeightedAverageGrantDateFairValueEndingBalance
Balance, Weighted average grant date fair value (in dollars per share)
Balance, Weighted average grant date fair value (in dollars per share)
Per share or unit weighted-average fair value of nonvested award options and non-option equity instruments.
Customer [Domain]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsNonvestedGrantsInPeriodWeightedAverageGrantDateFairValue
Granted, Weighted average grant date fair value (in dollars per share)
The weighted average fair value at grant date for nonvested equity-based awards granted during the period on options and non-option equity instruments.
us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Intangible assets
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsNonvestedOptionsVestedWeightedAverageGrantDateFairValue
Vested, Weighted average grant date fair value (in dollars per share)
The weighted average fair value as of grant date pertaining to an equity-based award plan options and non-option equity instruments for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.
lscc_RightofuseAssetsObtainedForNewAndModifiedLeaseContractsDuringThePeriod
Right-of-use assets obtained for new lease contracts during the period
represents right-of-use assets obtained for new and modified lease contracts during the period.
us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Accrued liabilities and reserves
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life (Year)
Interest income (expense), net
Cash flows from operating activities:
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Statement [Line Items]
Accounts receivable
us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Less: Allowance for credit losses
us-gaap_NumberOfOperatingSegments
Number of Operating Segments
Accounts receivable, net of allowance for credit losses
Accounts receivable, net of allowance for credit losses
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Stock-based and deferred compensation
Additional paid-in capital
AOCI Attributable to Parent [Member]
Stockholders' equity:
Leasehold Improvements [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Other income (expense), net
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset [Domain]
Segment Reporting Disclosure [Text Block]
Interest Income and Interest Expense Disclosure [Table Text Block]
us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Tax credit carry forwards
us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Net operating loss carry forwards
Chief Executive Officer [Member]
Current assets:
us-gaap_ContractWithCustomerAssetReclassifiedToReceivable
Transferred to Accounts receivable or collected
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Beginning cash and cash equivalents
Ending cash and cash equivalents
Inventory, Policy [Policy Text Block]
Effect of exchange rate change on cash
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase (decrease) in cash and cash equivalents
Unperformed performance obligations
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by (used in) financing activities
Contingencies (Note 14)
us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
Less: Product shipments from prepaid customer deposit
Executive Officer [Member]
us-gaap_OperatingIncomeLoss
Income from operations
us-gaap_DeferredTaxLiabilitiesOther
Other
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities
Prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by (used in) investing activities
Gross margin
Gross margin
Base Rate [Member]
Cost of revenue
Other Liabilities [Table Text Block]
us-gaap_ContractWithCustomerLiability
Contract liabilities, balance
Contract liabilities, balance
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Unremitted earnings
Other long-term liabilities
us-gaap_OtherSundryLiabilitiesNoncurrent
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Restricted stock unit tax withholdings
Liability for expiring production materials
us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Fixed assets
us-gaap_UndistributedEarningsOfForeignSubsidiaries
Undistributed Earnings of Foreign Subsidiaries
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageBasedOnMarketConditions
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions
Percentage of vesting of award under share-based payment arrangement based on market conditions.
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchase of common stock
Retained Earnings [Member]
Revenue
Revenue
us-gaap_TreasuryStockAcquiredAverageCostPerShare
Shares Acquired, Average Cost Per Share (in dollars per share)
Title and Position [Domain]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageOfMarketConditionAchieved
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved
The percentage of market condition achieved for awards to vest under share based payment arrangement.
Proceeds from issuance of common stock
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State
Title and Position [Axis]
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign
Additional Paid-in Capital [Member]
Common Stock [Member]
us-gaap_CurrentFederalTaxExpenseBenefit
Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal
Amortization of Acquired Intangible Assets [Member]
Represents amortization of acquired intangible assets.
Future Group [Member]
Represents the group called Future.
Equity Components [Axis]
Macnica Group [Member]
Represents the Macnica group.
Equity Component [Domain]
Arrow Electronics Inc [Member]
Represents information related to Arrow Electronics Inc.
lscc_OperatingLeaseLiabilitiesAdjustmentsForPresentValueForeignCurrencyAndRestructuringLiabilityEffects
Adjustments for present value and foreign currency effects
Amount of adjustments for present value, foreign currency, and restructuring liability effects on operating lease liabilities.
Lessee, Operating Lease Right-of-Use Assets and Liabilities [Table Text Block]
The tabular disclosure of lease right of use assets and liabilities for operating leases of the lessee.
us-gaap_CurrentIncomeTaxExpenseBenefit
Current Income Tax Expense (Benefit)
Other Noncurrent Assets [Member]
Lease liabilities accrued for new lease contracts during the period
Amount of increase in operating lease liability from additional liabilities incurred during the period.
Other Noncurrent Liabilities [Member]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Foreign
Adjustments for present value and foreign currency effects
Amount of adjustments for present value and foreign currency effects on right-of-use assets under operating lease.
Weikeng Group [Member]
Represents information related to Weikeng Group.
Q2 2019 Sales Plan [Member]
Represents the Q2 2019 sales plan.
Awards Vested or Exercised [Member]
Represent the awards vested or exercised.
Lease Termination and Fixed Assets [Member]
Represents lease termination and fixed assets.
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income taxes
Term Secured Overnight Financing Rate [Member]
Represent the interest rate related to the Term Secured Overnight Financing Rate for the periods.
lscc_OperatingLeaseLiabilityForPreviouslyRestructuredFacilities
Operating Lease Liability for Previously Restructured Facilities
Amount of liability for operating lease restructured prior to new standard adoption.
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Domestic
Repurchase Program 2024 [Member]
Represents information pertaining to Repurchase Program 2024.
ICFR Auditor Attestation Flag
Other comprehensive income (loss):
Other [Member]
Represents other.
Current portion of liability for non-cancelable contracts
Amount of liability for non-cancelable contracts, classified as current.
State and Local Jurisdiction [Member]
lscc_ContractWithCustomerLiabilityReleaseOfAccrualsForRecognizedStockRotationAndScrapReturns
Less: Release of accruals for recognized stock rotation and scrap returns
Represents release of accruals for recognized stock rotation and scrap returns for contract with customer liabilities.
Accruals for estimated future stock rotation and scrap returns
Represents accrued for estimated future stock rotation and scrap returns for contract with customer liability.
Revenues recorded during the period
Income Tax Jurisdiction [Axis]
Amortization of acquired intangible assets
Represents amortization of intangible assets acquired.
Income Tax Jurisdiction [Domain]
Disaggregation of Revenue [Table Text Block]
Domestic Tax Jurisdiction [Member]
Foreign Tax Jurisdiction [Member]
lscc_SharebasedPaymentArrangementExerciseAndVestingOfAwardsTaxBenefit
Share-Based Payment Arrangement, Exercise and Vesting of Awards, Tax Benefit
Represents the tax benefit related to the share-based payment arrangement of exercised and vesting awards.
Office Equipment [Member]
us-gaap_RepaymentsOfLongTermDebt
Repayment of long-term debt
Revenue from Contract with Customer [Text Block]
Document Annual Report
Tools, Dies and Molds [Member]
us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit
Cash and Cash Equivalents, Policy [Policy Text Block]
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Domain]
Entity Incorporation, State or Country Code
us-gaap_DebtInstrumentCarryingAmount
Long-Term Debt, Gross
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits
Balance
Balance
us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Accounting Policies [Abstract]
Document Transition Report
Document Financial Statement Error Correction [Flag]
Basis of Accounting, Policy [Policy Text Block]
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Reduction as a result of lapse of applicable statute of limitations
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Selling, General and Administrative Expenses [Member]
Entity Interactive Data Current
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Settlements
us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Additions based on tax positions of prior years
Security Exchange Name
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior years
us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions based on tax positions related to the current year
Title of 12(b) Security
Proceeds from long-term debt, net of issuance costs
Cost of Sales [Member]
Research and Development Expense [Member]
us-gaap_ValuationAllowancesAndReservesBalance
Balance
Balance
us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Charged (Credit) to costs and expenses
us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
Charged (credit) to other accounts
Charged (credit) to other accounts
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Domain]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Auditor Name
Auditor Firm ID
Auditor Location
Dilutive effect of employee equity incentive plans (in shares)
us-gaap_TaxCreditCarryforwardAmount
Tax Credit Carryforward, Amount
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Diluted (in shares)
us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Shares used in diluted Net income per share (in shares)
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards
Statement [Table]
Statement of Financial Position [Abstract]
Diluted (in dollars per share)
Basic (in shares)
Shares used in basic Net income per share (in shares)
Stock-based compensation
Other
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective income tax rate
Basic (in dollars per share)
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Valuation allowance
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
Other comprehensive income (loss)
us-gaap_RestructuringReserve
Accrued Restructuring
Accrued Restructuring
Change in uncertain tax benefit accrual
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Domain]
Sales Channel, Directly to Consumer [Member]
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Sales Channel, Through Intermediary [Member]
us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
Restructuring and Related Cost, Cost Incurred to Date
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
us-gaap_RestructuringAndRelatedCostIncurredCost
Restructuring and Related Cost, Incurred Cost
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Restructuring Plan [Axis]
Restructuring Plan [Domain]
srt_StockRepurchaseProgramAuthorizedAmount1
Share Repurchase Program, Authorized, Amount
Finite-Lived Intangible Assets Amortization Expense [Table Text Block]
Other Restructuring [Member]
Type of Restructuring [Domain]
Share Repurchase Program [Domain]
Share Repurchase Program [Axis]
Employee Severance [Member]
Restructuring and Related Activities Disclosure [Text Block]
State taxes, net
Foreign rate differential
Asset Acquisition, Contingent Consideration, Liability, Current
Restructuring Type [Axis]
Cash flows from financing activities:
Other long-term liabilities
Total other long-term liabilities
Statutory federal rate
Long-term portion of uncertain tax positions
Production Equipment and Software [Member]
Information pertaining to production equipment and software.
Foreign Countries [Member]
Information pertaining to foreign countries.
Amortization of right-of-use assets
Amortization of right-of-use assets during the period
us-gaap_StockholdersEquity
Total stockholders' equity
Balances
Balances
Class of Stock [Axis]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Insider Trading Policies and Procedures Adopted [Flag]
Insider Trading Policies and Procedures Adopted
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]