Document And Entity Information
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 1 - Basis of Presentation and Significant Accounting Policies
U.S Federal Statutory Tax Rate
Note 2 - Net Income Per Share
Weighted average risk-free interest rate
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
Weighted average expected volatility
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)
Expected term (years) (Year)
Expected term (in months) (Month)
Note 4 - Balance Sheet Components - Accounts Receivable (Details)
Note 4 - Balance Sheet Components - Inventories (Details)
ecd_TrdArrExpirationDate
Trading Arrangement Expiration Date
Note 4 - Balance Sheet Components - Accrued Liabilities (Details)
Note 4 - Balance Sheet Components - Accrued Liabilities (Details) (Parentheticals)
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)
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)
Note 8 - Restructuring - Activity Related to Restructuring Plans (Details) (Parentheticals)
Note 9 - Leases - Lease Balance Classifications Within the Consolidated Balance Sheets and Lease Activity (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]
Note 9 - Leases - Maturities of Operating Lease Liabilities (Details)
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Translation adjustment
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Vested, weighted average grant date fair value (in dollars per share)
Note 10 - Stock-based Compensation Plans - Stock-based Compensation (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Forfeited or expired, 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 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 12 - Income Taxes - Cash Taxes Paid (Details)
Note 15 - Segment Reporting - Segment Reporting (Details)
Notes To Financial Statements
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Notes To Financial Statements [Abstract]
Licensed Technology [Member]
Represents information pertaining to licensed technology.
The 2022 Credit Agreement [Member[
Represents information pertaining to the 2022 Credit Agreement.
lscc_PolicyTable
Contract liabilities
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]
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
us-gaap_PaymentsToAcquireIntangibleAssets
Cash paid for software and intellectual property licenses
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures
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
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
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Plan Name [Axis]
Plan Name [Domain]
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
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.
Effective Income Tax Rate Reconciliation [Table]
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
us-gaap_IntangibleAssetsNetExcludingGoodwill
Restricted Stock Units (RSUs) [Member]
Intangible Assets, gross
Restricted Stock [Member]
Performance Shares [Member]
us-gaap_InterestExpenseDebtExcludingAmortization
Contractual interest
Antidilutive Security, Excluded EPS Calculation [Table]
Accumulated depreciation
Accumulated depreciation and amortization
Total property and equipment, net
Property and equipment, less accumulated depreciation of $123,654 at January 3, 2026 and $125,901 at December 28, 2024
Contingencies Disclosure [Text Block]
Goodwill
Goodwill
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.
Cash flows from investing activities:
Net income per share:
Earnings Per Share [Text Block]
BERMUDA
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.
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued payroll obligations
CANADA
us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued liabilities
Income tax expense (benefit)
Effective Tax Rate
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.
Federal
us-gaap_IncomeTaxPaidFederalAfterRefundReceived
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.
us-gaap_DebtInstrumentTerm
Debt Instrument, Term (Year)
State
us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
Foreign
us-gaap_IncomeTaxPaidForeignAfterRefundReceived
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
New Accounting Pronouncements, Policy [Policy Text Block]
INDIA
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.
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
Impairment charges
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
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Impairment of Intangible Assets, Finite-Lived
Variable Rate [Domain]
us-gaap_AccountsReceivableNet
Accounts receivable, net
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
Award Timing MNPI Disclosure [Text Block]
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
Schedule of Long-Term Debt Instruments [Table]
Variable Rate [Axis]
Revenue Percentage
Concentration Risk, Percentage
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable, net
Stock-based compensation expense
ecd_AwardTmgMnpiCnsdrdFlag
Award Timing MNPI Considered [Flag]
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
Insider Trading Policies and Procedures [Line Items]
Entity Registrant Name
lscc_SharebasedPaymentArrangementBenefitFromForfeitures
Share-Based Payment Arrangement, Benefit From Forfeitures
The amount of benefit from forfeitures under share-based payment arrangement.
ecd_InsiderTrdPoliciesProcAdoptedFlag
Insider Trading Policies and Procedures Adopted [Flag]
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]
NETHERLANDS
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_TrdArrSecuritiesAggAvailAmt
Trading Arrangement, Securities Aggregate Available Amount
lscc_PercentageOfRevenue
Percentage of revenue
Represents the percentage of revenue.
Entity Common Stock, Shares Outstanding
Trading Arrangements, by Individual [Table]
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]
SINGAPORE
Local Phone Number
us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Line of Credit Facility, Commitment Fee Percentage
us-gaap_TableTextBlock
Notes Tables
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Q3 2024 Plan 1 [Member]
Represents Q3 2024 Plan.
Long-term portion of liability for non-cancellable contracts
Amount of liability for non-cancelable contracts, classified as noncurrent.
Common stock issued in connection with employee equity incentive awards, net of shares withheld for employee taxes (in shares)
Selling, general, and administrative
Common stock issued in connection with employee equity incentive awards, net of shares withheld for employee taxes
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)
Defined Benefit Plan [Table]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Basis of Accounting and Use Of Estimates, Policy [Policy Text Block]
Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). and for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
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)
Thereafter
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2029
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2030
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
2027
2028
2029
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2026
2030
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2027
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
us-gaap_PaymentsForRestructuring
Costs paid or otherwise settled
2026
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]
Intangible assets, amortization period (Year)
Business Combination [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:
Intangible Asset, Finite-Lived [Table]
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; 136,771,000 shares issued and outstanding as of January 3, 2026 and 137,704,000 shares issued and outstanding as of December 28, 2024
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Distributor C [Member]
Distributor C
Distributor D [Member]
Distributor D
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)
Distributor B [Member]
Distributor B
Distributors [Member]
Represents the distributors of the company.
Distributor A [Member]
Distributor A
Common stock, par value per share (in dollars per share)
Asia [Member]
Revenue from Contract with Customer [Policy Text Block]
The 2025 Inducement Equity Plan [Member]
The 2025 Inducement Equity Plan
us-gaap_DeferredTaxAssetsValuationAllowance
Less: valuation allowance
Statistical Measurement [Domain]
Lessee, Lease, Description [Table]
Operating lease payments
Operating cash used for payments on lease liabilities
Withholding tax
Amount 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 withholding taxes.
Maximum [Member]
Summary of Valuation Allowance [Table Text Block]
lscc_EffectiveIncomeTaxRateReconciliationSubpartFIncomeAmount
Subpart F Income
Amount of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to subpart F income.
Minimum [Member]
Withholding tax, percent
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 withholding taxes.
Changes in Unrecognized Tax Benefits
Amount 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 increase (decrease) in unrecognized tax benefits.
Lease liability
Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as lease liabilities.
Repurchase Program 2026 [Member]
Repurchase Program 2026
Product and Service [Axis]
us-gaap_DeferredTaxAssetsNet
Net deferred tax assets
Product and Service [Domain]
Statistical Measurement [Axis]
Right of use asset
Amount of deferred tax liability attributable to taxable temporary differences classified as right-of-use assets.
Other Countries [Member]
Other Countries
Other States [Member]
Other States
Corporate Vice President and Chief Accounting Officer [Member]
Corporate Vice President and Chief Accounting Officer
Senior Vice President and Chief Strategy and Marketing Officer [Member]
Senior Vice President and Chief Strategy and Marketing Officer
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued and outstanding
Net deferred taxes
Net deferred taxes
lscc_EffectiveIncomeTaxRateReconciliationSubpartFIncomePercent
Subpart F Income, percent
Percentage of reported income tax benefit from difference to income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to subpart F income.
Preferred stock, shares issued (in shares)
Cash Taxes Paid [Table Text Block]
Tabular disclosure on taxes paid in cash.
Interest paid
Changes in Unrecognized Tax Benefits, percent
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 changes in unrecognized tax benefits.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
us-gaap_DeferredTaxAssetsOther
Other
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
Deferred tax liabilities (included in Other long-term liabilities)
Europe [Member]
lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageBasedOnMarketConditionsExceeded
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions, Exceeded
The percentage of market condition achieved for awards to vest under share based payment arrangement that was exceeded.
Inventories, net
Total inventories, net
Preferred stock, par value per share (in dollars per share)
Customer [Axis]
Segment, Reconciliation of Other Items from Segments to Consolidated [Table]
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.
MINNESOTA
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 or renewed 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:
OREGON
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
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
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]
Property, Plant and Equipment [Table]
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
Revenue recognized from satisfied performance obligations
Executive Officer [Member]
us-gaap_OperatingIncomeLoss
Income (loss) 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_DeferredTaxLiabilitiesLeasingArrangements
Total deferred tax liabilities
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
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
Restructuring Charges and Other Miscellaneous Costs
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan and other miscellaneous costs.
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.
Class of Treasury Stock [Table]
Equity Components [Axis]
Equity Component [Domain]
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]
us-gaap_EffectiveIncomeTaxRateReconciliationFdiiPercent
Foreign-Derived Intangible Income, percent
Global Intangible low-taxed income
Lease liabilities accrued for new or renewed lease contracts during the period
Amount of increase in operating lease liability from additional liabilities incurred during the period.
Global Intangible low-taxed income, percent
Other Noncurrent Liabilities [Member]
Lease liability for renewed lease on facility restructured prior to adoption of ASC 842
Amount of increase in operating lease liabilities from adoption of new standard.
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.
us-gaap_EffectiveIncomeTaxRateReconciliationFdiiAmount
Foreign-Derived Intangible Income
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 (loss) before income taxes
Term Secured Overnight Financing Rate [Member]
Represent the interest rate related to the Term Secured Overnight Financing Rate for the periods.
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Domestic
ICFR Auditor Attestation Flag
Other comprehensive income (loss):
Other [Member]
Represents other.
Current portion of liability for non-cancellable 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]
Disaggregation of Revenue [Table]
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]
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]
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_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
Cost of Sales [Member]
All Individuals [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]
Individual [Axis]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Auditor Name
Auditor Firm ID
Auditor Location
Dilutive effect of employee equity incentive awards (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 payment awards, percent
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]
Other, percent
Other, percent
Other, percent
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Tax Rate, percent
Basic (in dollars per share)
Effects of Changes in Tax Law, percent
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Change in Valuation Allowance, percent
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]
us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Nondeductible expense, other, percent
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Stock-based compensation, percent
Accounting Standards Update and Change in Accounting Principle [Table]
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]
us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Foreign Tax Credits, percent
Share Repurchase Program [Domain]
Share Repurchase Program [Axis]
Employee Severance [Member]
Restructuring and Related Activities Disclosure [Text Block]
State Income Taxes, Net of Federal Benefit*, percent
Other Commitments [Table]
Statutory tax rate difference between Bermuda and United States, percent
Restructuring Cost [Table]
Asset Acquisition, Contingent Consideration, Liability, Current
Restructuring Type [Axis]
us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Research and Development tax credits, percent
Other
Other
Other
Cash flows from financing activities:
Other long-term liabilities
Total other long-term liabilities
U.S Federal Statutory Tax Rate, percent
Effects of Changes in Tax Law
Change in Valuation Allowance
us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount
Stock-based payment awards
Production Equipment and Software [Member]
Information pertaining to production equipment and software.
Foreign Countries [Member]
Information pertaining to foreign countries.
Offsetting Assets [Table]
Amortization of right-of-use assets
Amortization of right-of-use assets during the period
us-gaap_StockholdersEquity
Total stockholders' equity
Balances
Balances
Nondeductible expense, other
Class of Stock [Axis]
Stock-based compensation
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Foreign Tax Credits
State Income Taxes, Net of Federal Benefit*
Statutory tax rate difference between Bermuda and United States
us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Research and Development tax credits