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Acquisitions and Acquisition-Related Contingent Consideration (Details Textual) (USD $)
12 Months Ended 3 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
May 23, 2013
Jun. 13, 2014
Apr. 22, 2013
Business Acquisition [Line Items]            
Goodwill acquired during the period $ 102,025,000us-gaap_GoodwillAcquiredDuringPeriod $ 227,959,000us-gaap_GoodwillAcquiredDuringPeriod        
Valuation Allowance, Deferred Tax Asset, Change in Amount     219,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Transaction costs associated with acquisitions 3,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 8,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 1,500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts      
Jasper [Member]            
Business Acquisition [Line Items]            
Total consideration paid, net of cash acquired         139,400,000cdns_BusinessAcquisitionNetConsiderationPaidToAcquireBusinessNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_JasperMember
 
Cash acquired         28,700,000cdns_BusinessAcquisitionPurchaseCurrentAssetsCashAndCashEquivalentsOfAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= cdns_JasperMember
 
Other 2014 Acquisitions [Member]            
Business Acquisition [Line Items]            
Number of businesses acquired 2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
Total cash consideration paid, net of cash acquired 27,500,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
Cash Acquired from Acquisition 2,100,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
Goodwill acquired during the period 20,300,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
Finite-lived Intangible Assets Acquired 16,900,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
Recognized Identifiable Assets Acquired and Liabilities Assumed, Net (7,600,000)cdns_RecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cdns_Other2014AcquisitionsMember
         
2014 Acquisitions [Member]            
Business Acquisition [Line Items]            
Acquired definite-lived intangible assets, weighted average useful life 8 years          
Goodwill, expected tax deductible amount 2,900,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= cdns_A2014AcquisitionsMember
         
Tensilica [Member]            
Business Acquisition [Line Items]            
Total consideration paid, net of cash acquired           319,300,000cdns_BusinessAcquisitionNetConsiderationPaidToAcquireBusinessNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_TensilicaMember
Cash acquired           26,300,000cdns_BusinessAcquisitionPurchaseCurrentAssetsCashAndCashEquivalentsOfAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= cdns_TensilicaMember
Business acquisition fair value of options assumed           15,300,000cdns_BusinessAcquisitionTotalFairValueOfOptionsAssumed
/ us-gaap_BusinessAcquisitionAxis
= cdns_TensilicaMember
Business acquisition fair value of options assumed as consideration           500,000cdns_BusinessAcquisitionFairValueOfOptionsAssumedAsConsideration
/ us-gaap_BusinessAcquisitionAxis
= cdns_TensilicaMember
Business acquisition fair value of options assumed to be expensed over servicer period of award           14,800,000cdns_BusinessacquisitionFairvalueofoptionsassumedthatareconditionedonfutureservices
/ us-gaap_BusinessAcquisitionAxis
= cdns_TensilicaMember
Cosmic Circuit Private Limited [Member] | Trust For Benefit Of Children of Chief Executive Officer [Member]            
Business Acquisition [Line Items]            
Related Party, ownership percentage in acquired company       8.50%cdns_RelatedPartyOwnershipPercentageInAcquiredCompany
/ us-gaap_BusinessAcquisitionAxis
= cdns_CosmicCircuitPrivateLimitedMember
/ dei_LegalEntityAxis
= cdns_TrustForBenefitOfChildrenOfChiefExecutiveOfficerMember
   
Other 2013 Acquisitions [Member]            
Business Acquisition [Line Items]            
Total cash consideration paid, net of cash acquired   73,900,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_A2013AcquisitionsMember
       
Sigrity [Member]            
Business Acquisition [Line Items]            
Total cash consideration paid, net of cash acquired     64,300,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cdns_SigrityMember
     
Cash Acquired from Acquisition     $ 7,500,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= cdns_SigrityMember