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Derivative Financial Instruments (Details 3) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Derivative Instruments, Gain (Loss)      
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period     $ 900,000us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months 400,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet    
Not Designated as Hedging Instrument | Foreign currency forward contracts      
Derivative Instruments, Gain (Loss)      
Number of foreign currency forward contract held 1slab_NumberOfForeignCurrencyForwardContractHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0slab_NumberOfForeignCurrencyForwardContractHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Original notional value 7,700,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Not Designated as Hedging Instrument | Foreign currency forward contracts | Other income (expense), net      
Derivative Instruments, Gain (Loss)      
Gain (Loss) Recognized in Income 1,075,000us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= slab_OtherIncomeExpenseNetMember
   
Cash flow hedges | Interest rate swaps      
Derivative Instruments, Gain (Loss)      
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period (799,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
611,000us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
(956,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Original notional value 100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
   
Cash flow hedges | Interest rate swaps | Rent expenses      
Derivative Instruments, Gain (Loss)      
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period     (2,197,000)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= slab_RentExpensesMember
Cash flow hedges | Interest rate swaps | Interest expense      
Derivative Instruments, Gain (Loss)      
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period $ (618,000)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ (560,000)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ (98,000)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember