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Fair Value of Financial Instruments (Details 2) (Auction rate securities, Weighted Average, Discounted cash flow) | 9 Months Ended
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Sep. 27, 2014
Auction rate securities | Weighted Average | Discounted cash flow |
Quantitative information for Level 3 Fair Value Measurements Assets |
Estimated yield (as a percent) | 1.15%
Expected holding period | 10 years
Estimated discount rate (as a percent) | 3.50%

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