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Revenue from Contracts with Customers - Contract Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Movement In Contract With Customer, Liability, Net [Roll Forward] |  |
Beginning balance | $ 1,614 | $ 0
Accruals for estimated future stock rotation and scrap returns | 5,763 | 4,281
Less: Release of accruals for recognized stock rotation and scrap returns | (5,064) | (2,667)
Ending balance | 2,313 | 1,614
Processing of RMAs | 5,000 | 3,700
Net revenue increase (decrease) | $ 100 | $ (1,000)

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- Definition Contract With Customer, Liability, Accrued For Estimated Future Stock Rotation And Scrap Returns + References No definition available. + Details
Name: | lscc_ContractWithCustomerLiabilityAccruedForEstimatedFutureStockRotationAndScrapReturns
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Release Of Accruals For Recognized Stock Rotation And Scrap Returns + References No definition available. + Details
Name: | lscc_ContractWithCustomerLiabilityReleaseOfAccrualsForRecognizedStockRotationAndScrapReturns
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Movement In Contract With Customer, Liability [Roll Forward] + References No definition available. + Details
Name: | lscc_MovementInContractWithCustomerLiabilityRollForward
Namespace Prefix: | lscc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue From Contract With Customer, Net Impact From Release Of Accruals Offsetting By Return Merchandise Authorization + References No definition available. + Details
Name: | lscc_RevenueFromContractWithCustomerNetImpactFromReleaseOfAccrualsOffsettingByReturnMerchandiseAuthorization
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue From Contract With Customer, Processing Of Return Merchandise Authorizations + References No definition available. + Details
Name: | lscc_RevenueFromContractWithCustomerProcessingOfReturnMerchandiseAuthorizations
Namespace Prefix: | lscc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant