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Business Combinations and Goodwill (Allocation of the Purchase Price) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Mar. 10, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill $ 268,698us-gaap_Goodwill $ 44,808us-gaap_Goodwill  
Silicon Image, Inc      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Cash, cash equivalents and short-term investments     157,923us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Accounts receivable     30,677us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Inventory     20,839us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Other current assets     7,183us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Property, plant and equipment     23,429us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Other assets     1,573us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Intangible assets     192,079us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Goodwill     223,890us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Total assets acquired     657,593lscc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsAcquiredIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Accounts payable and other accrued liabilities     46,350us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Other current liabilities     1,252us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Long-term liabilities     14,342us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Redeemable noncontrolling interest     7,172lscc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRedeemableNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Total liabilities assumed     69,116us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Fair value of net assets acquired     $ 588,477us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember