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Restructuring and Other Charges Restructuring and Other Charges (Details Textual) (USD $)
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 10,252,000us-gaap_RestructuringCharges $ 17,999,000us-gaap_RestructuringCharges $ 113,000us-gaap_RestructuringCharges  
Restructuring Reserve 6,210,000us-gaap_RestructuringReserve 14,224,000us-gaap_RestructuringReserve 4,343,000us-gaap_RestructuringReserve 5,027,000us-gaap_RestructuringReserve
Maximum Amount of estimated lease losses based on changes in assumptions 1,800,000cdns_AmountOfEstimatedLeaseLossesBasedOnChangesInAssumptions      
2014 Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 11,600,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= cdns_A2014RestructuringPlanMember		      
Restructuring Reserve 4,300,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= cdns_A2014RestructuringPlanMember		      
2013 Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 17,700,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= cdns_A2013RestructuringPlanMember		      
Restructuring Reserve 1,200,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= cdns_A2013RestructuringPlanMember		      
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve $ 700,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember