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Long-Term Debt (Debt Schedule) (Details) (Line of Credit, Term Loan, USD $)
Apr. 04, 2015
Mar. 10, 2015
Mar. 29, 2014
Line of Credit | Term Loan
     
Debt Instrument [Line Items]      
Principal amount $ 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
$ 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
$ 0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Unamortized original issue discount and debt issuance costs (11,500,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(3,500,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Less current portion of Long-term debt (122,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  0us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Long-term debt $ 338,378,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  $ 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lscc_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember