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Fair Value of Financial Instruments (Details 2) (Auction rate securities, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 29, 2012
Quantitative information for Level 3 Fair Value Measurements Assets |
Fair value Assets | 11,369
Weighted Average | Discounted cash flow |
Quantitative information for Level 3 Fair Value Measurements Assets |
Estimated yield (as a percent) | 1.24%
Expected holding period | 10 years
Estimated discount rate (as a percent) | 2.78%

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- 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

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- 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

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- 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

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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