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Stock Compensation Plans and Stock Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Stock based compensation expense and allocation by cost      
Stock-based compensation $ 83,792us-gaap_ShareBasedCompensation $ 66,285us-gaap_ShareBasedCompensation $ 47,561us-gaap_ShareBasedCompensation
Cost of product and maintenance [Member]      
Stock based compensation expense and allocation by cost      
Stock-based compensation 2,244us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,596us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,317us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Cost of services [Member]      
Stock based compensation expense and allocation by cost      
Stock-based compensation 3,280us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdns_CostOfServicesMember		 2,321us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdns_CostOfServicesMember		 1,889us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdns_CostOfServicesMember
Marketing and sales [Member]      
Stock based compensation expense and allocation by cost      
Stock-based compensation 20,580us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 15,642us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 10,193us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
Research and development [Member]      
Stock based compensation expense and allocation by cost      
Stock-based compensation 43,173us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 32,999us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 21,516us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
General and administrative [Member]      
Stock based compensation expense and allocation by cost      
Stock-based compensation $ 14,515us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 13,727us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 12,646us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember