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Stock-Based Compensation (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Stock-based compensation costs      
Net reduction in selling, general and administrative expense     $ 1,900,000slab_EmployeeServiceShareBasedCompensationNetReductionInSellingGeneralAndAdministrativeExpense
MSUs      
Stock-based compensation costs      
Number of shares granted 76,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
   
Weighted-average fair value for purchase rights granted (in dollars per share) $ 60.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
$ 31.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
$ 53.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
Fair value assumptions      
Cash consideration based upon achievement of specified levels of market conditions $ 0slab_ShareBasedCompensationArrangementCashConsiderationBasedUponAchievementOfSpecifiedLevelsOfMarketConditions
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
   
2009 Stock Incentive Plan      
Stock-based compensation costs      
Number of share pools under the 2009 Plan 2slab_NumberOfSharePools
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
   
Fair value assumptions      
Expected volatility (as a percent) 33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
32.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
32.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
Risk-free interest rate % 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
0.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
Expected term 2 years 9 months 18 days 2 years 10 months 24 days 2 years 10 months 24 days
2009 Stock Incentive Plan | Low end of range      
Stock-based compensation costs      
Award vesting period 3 years    
2009 Stock Incentive Plan | High end of range      
Stock-based compensation costs      
Award vesting period 4 years    
2009 Stock Incentive Plan | Stock options      
Stock-based compensation costs      
Minimum exercise price as percentage of fair market value of shares on the date of grant 100.00%slab_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceAsPercentageOfGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
   
Stock options granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
2009 Stock Incentive Plan | Full value awards      
Stock-based compensation costs      
Number of shares granted 800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_FullValueAwardsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_FullValueAwardsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_FullValueAwardsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
2009 Stock Incentive Plan | Full value awards | Prior Pool      
Stock-based compensation costs      
Number of shares deducted for each share granted under 2009 Stock Incentive Plan 1.55slab_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeDeductedFromSharesAvailableForIssuanceForEachShareGranted
/ us-gaap_AwardTypeAxis
= slab_FullValueAwardsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
/ slab_SharePoolAxis
= slab_PriorPoolMember
   
2009 Stock Incentive Plan | MSUs      
Stock-based compensation costs      
Award vesting period 3 years    
Number of shares granted 76,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
132,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
110,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= slab_MarketStockUnitsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
2009 Stock Incentive Plan | Stock options and stock appreciation rights | Prior Pool      
Stock-based compensation costs      
Number of shares deducted for each share granted under 2009 Stock Incentive Plan 1slab_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeDeductedFromSharesAvailableForIssuanceForEachShareGranted
/ us-gaap_AwardTypeAxis
= slab_EmployeeStockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
/ slab_SharePoolAxis
= slab_PriorPoolMember
   
2009 Stock Incentive Plan | Stock options, stock appreciation rights and full value awards | New Pool      
Stock-based compensation costs      
Number of shares deducted for each share granted under 2009 Stock Incentive Plan 1slab_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeDeductedFromSharesAvailableForIssuanceForEachShareGranted
/ us-gaap_AwardTypeAxis
= slab_EmployeeStockOptionsStockAppreciationRightsAndFullValueAwardsMember
/ us-gaap_PlanNameAxis
= slab_StockIncentivePlan2009Member
/ slab_SharePoolAxis
= slab_NewPoolMember
   
2000 Stock Incentive Plan | Low end of range      
Stock-based compensation costs      
Award vesting period 3 years    
2000 Stock Incentive Plan | High end of range      
Stock-based compensation costs      
Award vesting period 8 years    
2000 Stock Incentive Plan | Stock options | High end of range      
Stock-based compensation costs      
Term of award 10 years    
2009 Employee Stock Purchase Plan      
Stock-based compensation costs      
Minimum exercise price as percentage of fair market value of shares on the date of grant 85.00%slab_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceAsPercentageOfGrantDateFairValue
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
   
Maximum term of offering 24 months    
Shares issued 204,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
190,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
181,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
Weighted-average fair value for purchase rights granted (in dollars per share) $ 12.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
   
Fair value assumptions      
Expected volatility (as a percent) 28.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
27.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
38.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
Risk-free interest rate % 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= slab_EmployeeStockPurchasePlan2009Member
Expected term 15 months 7 months 15 months