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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Summary of income tax reconciliation      
Provision computed at federal statutory income tax rate $ 63,350us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 55,648us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 65,895us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income tax, net of federal tax effect 1,168us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 4,085us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,626us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign income tax rate differential (39,012)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (39,144)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (39,308)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Non-deductible share-based compensation costs 5,726us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 2,053us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 7,785us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Change in deferred tax valuation allowance 10,065us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 18,354us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (301,542)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax credits (17,331)us-gaap_IncomeTaxReconciliationTaxCredits (18,372)us-gaap_IncomeTaxReconciliationTaxCredits (3,744)us-gaap_IncomeTaxReconciliationTaxCredits
Repatriation of foreign earnings (2,910)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings (2,116)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings (2,645)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Non-deductible research and development expense 2,195us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment 3,043us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment 1,968us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment
Tax effects of intra-entity transfer of assets (5,397)cdns_EffectiveIncomeTaxRateReconciliationTaxeffectsofintraentitytransferofassets 270cdns_EffectiveIncomeTaxRateReconciliationTaxeffectsofintraentitytransferofassets 148cdns_EffectiveIncomeTaxRateReconciliationTaxeffectsofintraentitytransferofassets
Domestic production activity deduction (1,281)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (1,088)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities 0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Withholding taxes 4,064cdns_IncomeTaxReconciliationWithholdingTaxes 3,333cdns_IncomeTaxReconciliationWithholdingTaxes 3,593cdns_IncomeTaxReconciliationWithholdingTaxes
Tax settlements, domestic 0us-gaap_IncomeTaxReconciliationTaxSettlementsDomestic 0us-gaap_IncomeTaxReconciliationTaxSettlementsDomestic (37,481)us-gaap_IncomeTaxReconciliationTaxSettlementsDomestic
Interest and penalties not included in tax settlements (382)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1,701us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 2,552us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Increase (decrease) in unrecognized tax benefits not included in tax settlements 157us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease (33,730)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease 47,329us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Other 1,692us-gaap_IncomeTaxReconciliationOtherAdjustments 716us-gaap_IncomeTaxReconciliationOtherAdjustments 147us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision (benefit) for income taxes $ 22,104us-gaap_IncomeTaxExpenseBenefit $ (5,247)us-gaap_IncomeTaxExpenseBenefit $ (251,677)us-gaap_IncomeTaxExpenseBenefit
Effective tax rate 12.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (3.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (134.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations