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Restructuring and Other Charges (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Jan. 03, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 4,359us-gaap_RestructuringCharges $ 396us-gaap_RestructuringCharges  
Restructuring reserve 6,535us-gaap_RestructuringReserve   6,210us-gaap_RestructuringReserve
2015 Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4,612us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= cdns_A2015RestructuringPlanMember
   
Restructuring reserve $ 4,100us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= cdns_A2015RestructuringPlanMember