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Business Combinations and Goodwill (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 31, 2011
Jan. 26, 2015
Business Acquisition [Line Items]        
Goodwill $ 44,808,000us-gaap_Goodwill $ 44,808,000us-gaap_Goodwill    
Goodwill and intangible asset impairment 0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment    
SiliconBlue Technologies Ltd.        
Business Acquisition [Line Items]        
Consideration in cash     63,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconblueTechnologiesLtdMember
 
Goodwill     43,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconblueTechnologiesLtdMember
 
Intangible assets     18,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconblueTechnologiesLtdMember
 
Subsequent Event [Member] | Silicon Image, Inc [Member]        
Business Acquisition [Line Items]        
Business acquisition, share price       $ 7.30us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Business combination, consideration transferred       $ 602,050,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember