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Business Combinations and Goodwill (Identified Intangible Assets Acquired) (Details) (Silicon Image, Inc, USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 10, 2015
Mar. 10, 2015
Allocation of purchase price to assets acquired based on fair values:    
Total identified finite-lived intangible assets $ 157,079us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles $ 157,079us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Total identified intangible assets 192,079us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill 192,079us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Developed technology    
Allocation of purchase price to assets acquired based on fair values:    
Total identified finite-lived intangible assets 125,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
125,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Customer relationships    
Allocation of purchase price to assets acquired based on fair values:    
Total identified finite-lived intangible assets 29,458us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
29,458us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Licensing Agreements    
Allocation of purchase price to assets acquired based on fair values:    
Total identified finite-lived intangible assets 1,852us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
1,852us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Patents    
Allocation of purchase price to assets acquired based on fair values:    
Total identified finite-lived intangible assets 769us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
769us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Asset Life in Years 5 years  
In Process Research and Development [Member]    
Allocation of purchase price to assets acquired based on fair values:    
In-process research and development $ 35,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
$ 35,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Minimum | Developed technology    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 3 years  
Minimum | Customer relationships    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 4 years  
Minimum | Licensing Agreements    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 3 years  
Maximum | Developed technology    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 5 years  
Maximum | Customer relationships    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 7 years  
Maximum | Licensing Agreements    
Allocation of purchase price to assets acquired based on fair values:    
Asset Life in Years 5 years