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Fair Value of Financial Instruments (Details 2) (Auction rate securities, Weighted Average, Discounted cash flow) | 12 Months Ended
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Jan. 03, 2015
Auction rate securities | Weighted Average | Discounted cash flow |
Quantitative information for Level 3 Fair Value Measurements Assets |
Estimated yield (as a percent) | 1.04%slab_FairValueInputsEstimatedInterestRates / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = slab_DiscountedCashFlowValuationTechniqueMember
Expected holding period | 10 years
Estimated discount rate (as a percent) | 3.23%slab_FairValueInputsLiquidityDiscount / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = slab_DiscountedCashFlowValuationTechniqueMember

X
- Definition Represents the estimated interest rates, used as an input to measure fair value. + References No definition available. + Details
Name: | slab_FairValueInputsEstimatedInterestRates
Namespace Prefix: | slab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expected holding period, used as an input to measure fair value. + References No definition available. + Details
Name: | slab_FairValueInputsExpectedHoldingPeriods
Namespace Prefix: | slab_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the liquidity discount, used as an input to measure fair value. + References No definition available. + Details
Name: | slab_FairValueInputsLiquidityDiscount
Namespace Prefix: | slab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration