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v2.4.1.9

Income Taxes (Details 2) (USD $) | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Operating loss and tax credit carryforwards |  |  |
Net deferred tax assets (Liabilities) | $ 27,590,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 31,336,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Provision for U.S. federal and state income taxes | 0 slab_ProvisionForUndistributedEarningsFromForeignSubsidiaries |  |
Income tax benefit reflected in earnings | (11,019,000)us-gaap_IncomeTaxExpenseBenefit | (12,208,000)us-gaap_IncomeTaxExpenseBenefit | (22,800,000)us-gaap_IncomeTaxExpenseBenefit
Singapore |  |  |
Operating loss and tax credit carryforwards |  |  |
Income tax benefit reflected in earnings | 2,000,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_SG | (2,200,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_SG | (13,300,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_SG
The income tax benefit per diluted share (in dollars per share) | $ 0.05 slab_IncomeTaxBenefitPerDilutedShare / us-gaap_StatementGeographicalAxis = country_SG | $ 0.05 slab_IncomeTaxBenefitPerDilutedShare / us-gaap_StatementGeographicalAxis = country_SG | $ (0.31)slab_IncomeTaxBenefitPerDilutedShare / us-gaap_StatementGeographicalAxis = country_SG
State |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | 57,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Research and development tax credit carryforwards | 11,800,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember | Federal |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | 64,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = slab_CygnalIntegratedProductsAndSiliconClocksIncSpectraLinearAndEmberMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Research and development tax credit carryforwards | 2,000,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_BusinessAcquisitionAxis = slab_CygnalIntegratedProductsAndSiliconClocksIncSpectraLinearAndEmberMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Energy Micro | Foreign |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | $ 21,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = slab_EnergyMicroMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |

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- Definition Represents the provision for undistributed foreign earnings, upon which no federal or state taxes have been provided, that are considered to be permanently reinvested abroad, as of the balance sheet date. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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