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Business Combinations and Goodwill (Acquisition Silicon Image) (Details) (Silicon Image, Inc, USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 10, 2015
Silicon Image, Inc
 
Business Combination, Consideration Transferred [Abstract]  
Cash paid to Silicon Image stockholders $ 575,955us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Cash paid for options and restricted stock units 2,205us-gaap_OtherPaymentsToAcquireBusinesses
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Accrual for options and restricted stock units 5,178lscc_BusinessCombinationConsiderationTransferredAccrualforOptionsandRestrictedStockUnits
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Fair value of partially vested assumed equity awards 5,139us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Total purchase consideration $ 588,477us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember