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Fair Value of Financial Instruments (Details 3) (Contingent consideration, Monte Carlo simulation) | 12 Months Ended
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Jan. 03, 2015
Quantitative information for Level 3 fair value measurements liabilities |
Expected revenue volatility (as a percent) | 20.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Low end of range |
Quantitative information for Level 3 fair value measurements liabilities |
Expected revenue growth rate (as a percent) | 35.60%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByLiabilityClassAxis = slab_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = slab_MonteCarloSimulationMember
Expected term | 0 years
Estimated discount rate (as a percent) | 0.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = slab_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = slab_MonteCarloSimulationMember
High end of range |
Quantitative information for Level 3 fair value measurements liabilities |
Expected revenue growth rate (as a percent) | 69.10%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByLiabilityClassAxis = slab_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = slab_MonteCarloSimulationMember
Expected term | 4 years
Estimated discount rate (as a percent) | 1.70%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = slab_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = slab_MonteCarloSimulationMember

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Period Type: | duration

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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Data Type: | num:percentItemType
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- Details
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- Definition Percentage of assumed long-term growth in revenues, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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