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Note 10 - Stock-Based Compensation Plans - Share Based Compensation Performance Shares Award Outstanding (Details) - Performance Shares [Member] shares in Thousands | 12 Months Ended
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Jan. 02, 2021 $ / shares shares
Balance, Shares (in shares) | 1,163
Balance, Weighted average grant date fair value (in dollars per share) | $ / shares | $ 14.49
Granted, Shares (in shares) | 349
Granted, Weighted average grant date fair value (in dollars per share) | $ / shares | $ 32.23
Effect of vesting multiplier, Shares (in shares) | 472
Vested, Shares (in shares) | (963)
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares | $ 15.63
Canceled, Shares (in shares) | 0
Balance, Shares (in shares) | 1,021
Balance, Weighted average grant date fair value (in dollars per share) | $ / shares | $ 20.42

X
- Definition 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. + References No definition available. + Details
Name: | lscc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedEffectOfVestingMultiplier
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of nonvested share options and non-option equity instruments (or share units) granted during the period. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedGrantsInPeriodGross
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-vested options and non-option equity instruments outstanding. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of non-vested options and non-option equity instruments forfeited. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedOptionsForfeitedNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-vested options and non-option equity instruments. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedOptionsNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards granted during the period on options and non-option equity instruments. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsNonvestedGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | lscc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
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Data Type: | num:perShareItemType
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Period Type: | duration

X
- Definition Per share or unit weighted-average fair value of nonvested award options and non-option equity instruments. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsNonvestedWeightedAverageGrantDateFairValueEndingBalance
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |