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Fair Value of Financial Instruments (Details 5) (USD $)
3 Months Ended
Apr. 04, 2015
Jan. 03, 2015
Term Loan Facility    
Fair value liabilities reconciliation of changes    
Fair value of debt $ 84,900,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
$ 87,400,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
Assets and liabilities measured at fair value on recurring basis | Contingent consideration    
Fair value liabilities reconciliation of changes    
Balance at the beginning of the period 18,438,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= slab_ContingentConsiderationMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Settlements (4,464,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= slab_ContingentConsiderationMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Loss recognized in earnings 830,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= slab_ContingentConsiderationMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Balance at the end of the period 14,804,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= slab_ContingentConsiderationMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Net loss for the period included in earnings attributable to contingent consideration held at the end of the period: $ (830,000)slab_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInSellingGeneralAndAdministrativeExpenseOrOtherIncome
/ us-gaap_FairValueByLiabilityClassAxis
= slab_ContingentConsiderationMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember