Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Revenue:
Product and maintenance	$ 383,637cdns_ProductAndMaintenanceRevenue	$ 357,350cdns_ProductAndMaintenanceRevenue
Services	27,729us-gaap_TechnologyServicesRevenue	21,200us-gaap_TechnologyServicesRevenue
Total revenue	411,366us-gaap_SalesRevenueNet	378,550us-gaap_SalesRevenueNet
Costs and Expenses:
Cost of product and maintenance	42,059cdns_CostOfProductAndMaintenance	42,197cdns_CostOfProductAndMaintenance
Cost of services	18,526us-gaap_TechnologyServicesCosts	14,902us-gaap_TechnologyServicesCosts
Marketing and sales	100,268us-gaap_SellingAndMarketingExpense	98,323us-gaap_SellingAndMarketingExpense
Research and development	162,996	146,466
General and administrative	27,642us-gaap_GeneralAndAdministrativeExpense	28,744us-gaap_GeneralAndAdministrativeExpense
Amortization of acquired intangibles	6,231us-gaap_AmortizationOfIntangibleAssets	5,210us-gaap_AmortizationOfIntangibleAssets
Restructuring and other charges	4,359us-gaap_RestructuringCharges	396us-gaap_RestructuringCharges
Total costs and expenses	362,081us-gaap_CostsAndExpenses	336,238us-gaap_CostsAndExpenses
Income from operations	49,285us-gaap_OperatingIncomeLoss	42,312us-gaap_OperatingIncomeLoss
Interest expense	(11,754)us-gaap_InterestExpense	(7,268)us-gaap_InterestExpense
Other income, net	4,781us-gaap_OtherNonoperatingIncomeExpense	3,382us-gaap_OtherNonoperatingIncomeExpense
Income before provision for income taxes	42,312	38,426
Provision for income taxes	6,053us-gaap_IncomeTaxExpenseBenefit	5,356us-gaap_IncomeTaxExpenseBenefit
Net income	$ 36,259us-gaap_NetIncomeLoss	$ 33,070us-gaap_NetIncomeLoss
Net income per share - basic (in usd per share)	$ 0.13us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic
Net income per share - diluted (in usd per share)	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding - basic (in shares)	284,523	281,615
Weighted average common shares outstanding - diluted (in shares)	311,847	301,034

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