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Fair Value (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Liabilities included in level 3 representing fair value of contingent consideration associated with acquisitions    
Ending Balance   $ 4,091us-gaap_BusinessCombinationContingentConsiderationLiability
Fair Value Measurements, Level 3 [Member]    
Liabilities included in level 3 representing fair value of contingent consideration associated with acquisitions    
Beginning Balance 4,091us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 4,218us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Payments (2,329)cdns_PaymentOfAcquisitionRelatedContingentConsideration
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (835)cdns_PaymentOfAcquisitionRelatedContingentConsideration
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Adjustments (1,762)cdns_BusinessAcquisitionContingentConsiderationAtFairValueAdjustments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 708cdns_BusinessAcquisitionContingentConsiderationAtFairValueAdjustments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Ending Balance $ 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 4,091us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member