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Debt (Details) (USD $)
1 Months Ended 12 Months Ended
Jul. 31, 2012
Jan. 03, 2015
Sep. 27, 2012
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      
2014   10,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
2015   10,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
2016   67,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Total debt   87,500,000us-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