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Debt (Details) (USD $)
3 Months Ended 1 Months Ended
Apr. 04, 2015
Jul. 31, 2012
Jan. 30, 2015
Sep. 27, 2012
Bluegiga        
Debt        
Debt in connection with acquisition     $ 2,232,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= slab_BluegigaTechnologiesOyMember
 
Debt instrument, interest rate, minimum 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_BusinessAcquisitionAxis
= slab_BluegigaTechnologiesOyMember
     
Debt instrument, interest rate, maximum 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_BusinessAcquisitionAxis
= slab_BluegigaTechnologiesOyMember
     
Term Loan Facility        
Debt        
Maximum borrowing capacity   100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
   
Percentage of principal amortization in each of the first two years   5.00%slab_LineOfCreditFacilityPercentageAmortizationOfPrincipalInEachOfFirstTwoYears
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
   
Number of years for which the percentage of principal amortization is five percent   2 years    
Percentage of principal amortization in each of the next three years   10.00%slab_LineOfCreditFacilityPercentageAmortizationOfPrincipalInYearsThreeThroughFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
   
Number of years for which the percentage of principal amortization is ten percent   3 years    
Amount borrowed under the term loan facility       100,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
Fixed interest rate percentage 0.764%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
Combined interest rate percentage 2.514%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
Term Loan Facility        
2015 7,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
2016 10,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
2017 67,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
Total debt 85,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
Agreement        
Debt        
Maximum borrowing capacity   230,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
   
Term of debt instrument   5 years    
Maximum leverage ratio 2.5slab_LineOfCreditFacilityMaximumLeverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
     
Minimum fixed charge coverage ratio 1.50slab_LineOfCreditFacilityMinimumFixedChargeCoverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
     
Revolving Credit Facility        
Debt        
Maximum borrowing capacity   130,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Sublimit on letters of credit   25,000,000slab_LettersOfCreditMaximumAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Sublimit on swingline loan   10,000,000slab_SwinglineLoanMaximumAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Additional increase in borrowing capacity of the line of credit available at the entity's option   $ 50,000,000slab_LineOfCreditFacilityAdditionalCapacityIncreaseOption
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Term loan facility and revolving credit facility, other than swingline loans | LIBOR | Low end of range        
Debt        
Interest rate added to the base rate (as a percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityAndRevolvingCreditFacilityOtherThanSwinglineLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Term loan facility and revolving credit facility, other than swingline loans | LIBOR | High end of range        
Debt        
Interest rate added to the base rate (as a percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityAndRevolvingCreditFacilityOtherThanSwinglineLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Term loan facility and revolving credit facility, other than swingline loans | Federal Funds        
Debt        
Interest rate added to the base rate (as a percent) 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityAndRevolvingCreditFacilityOtherThanSwinglineLoansMember
/ us-gaap_VariableRateAxis
= slab_DebtInstrumentVariableRateBaseFederalFundsMember
     
Term loan facility and revolving credit facility, other than swingline loans | one-month LIBOR        
Debt        
Interest rate added to the base rate (as a percent) 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityAndRevolvingCreditFacilityOtherThanSwinglineLoansMember
/ us-gaap_VariableRateAxis
= slab_DebtInstrumentVariableRateBaseOneMonthLIBORMember
     
Term loan facility, revolving credit facility, swingline and other loans | Base rate | Low end of range        
Debt        
Interest rate added to the base rate (as a percent) 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityRevolvingCreditFacilitySwinglineAndOtherLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= slab_DebtInstrumentVariableRateBaseBaseRateMember
     
Term loan facility, revolving credit facility, swingline and other loans | Base rate | High end of range        
Debt        
Interest rate added to the base rate (as a percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= slab_TermLoanFacilityRevolvingCreditFacilitySwinglineAndOtherLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= slab_DebtInstrumentVariableRateBaseBaseRateMember