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Fair Value of Financial Instruments (Details 3) (Contingent consideration, USD $) | 12 Months Ended
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Dec. 29, 2012
Quantitative information for Level 3 Fair Value Measurements Liability |
Label Fair value Liabilities | $ 2,750,000
Probability weighted discounted cash flow | Weighted Average |
Quantitative information for Level 3 Fair Value Measurements Liability |
Estimated outcomes if milestone goals are achieved | 2,800,000
Estimated probability of achieving each outcome (as a percent) | 33.00%
Estimated discount rate (as a percent) | 5.10%
Probability weighted discounted cash flow | Minimum |
Quantitative information for Level 3 Fair Value Measurements Liability |
Estimated outcomes if milestone goals are achieved | 1,200,000
Estimated probability of achieving each outcome (as a percent) | 25.00%
Probability weighted discounted cash flow | Maximum |
Quantitative information for Level 3 Fair Value Measurements Liability |
Estimated outcomes if milestone goals are achieved | $ 4,200,000
Estimated probability of achieving each outcome (as a percent) | 50.00%

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- Definition Represents the estimated possible outcomes upon achievement of certain milestone goals, used as an input to measure fair value. + References No definition available. + Details
Name: | slab_FairValueInputsEstimatedPossibleOutcomeUponAchievementOfCertainMilestoneGoals
Namespace Prefix: | slab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the percentage of estimated probability of achieving each outcome, used as an input to measure fair value. + References No definition available. + Details
Name: | slab_FairValueInputsEstimatedProbabilityOfAchievingEachOutcome
Namespace Prefix: | slab_
Data Type: | num:percentItemType
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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- Details
Name: | us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the liabilities 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_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant