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Stock Compensation Plans and Stock Based Compensation (Details Textual) (USD $)
12 Months Ended
Jan. 03, 2015
One Thousand Nine Hundred Ninety Five Directors Stock Options Plan [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under equity incentive plan 3,550,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cdns_OneThousandNineHundredNinetyFiveDirectorsStockOptionsPlanMember
Minimum vesting period 1 year
Term of options granted under Directors' Plan 10 years
Employee stock purchase plans [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under Employee Stock Purchase Plan 74,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanEsppMember
Percentage of lower of fair market value at beginning or end of applicable offering period used for calculating price of common stock to be purchased by employees 85.00%cdns_PercentageOfLowerOfFairMarketValueAtBeginningOrEndOfApplicableOfferingPeriodUsedForCalculatingPriceOfCommonStockToBePurchasedByEmployees
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanEsppMember
Purchase period for common stock 6 months
Employee Stock Purchase Plan with Offering Period Commencing on August One Two Thousand Nine [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Maximum percentage of annual base earnings plus bonuses and commissions for which common stock can be purchased by employees 5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanWithOfferingPeriodCommencingOnAugustOneTwoThousandNineMember
Maximum amount for which common stock can be purchased by employees in any calendar year 7,058.82cdns_MaximumAmountForWhichCommonStockCanBePurchasedByEmployeesInAnyCalendarYear
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanWithOfferingPeriodCommencingOnAugustOneTwoThousandNineMember
Employee Stock Purchase Plan with Offering Period Commencing on February One Two Thousand Fourteen [Member] [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Maximum percentage of annual base earnings plus bonuses and commissions for which common stock can be purchased by employees 7.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanwithOfferingPeriodCommencingonFebruaryOneTwoThousandFourteenMemberMember
Maximum amount for which common stock can be purchased by employees in any calendar year 9,411.76cdns_MaximumAmountForWhichCommonStockCanBePurchasedByEmployeesInAnyCalendarYear
/ us-gaap_PlanNameAxis
= cdns_EmployeeStockPurchasePlanwithOfferingPeriodCommencingonFebruaryOneTwoThousandFourteenMemberMember
2014 Omnibus Equity Incentive Plan [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under equity incentive plan 15,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cdns_A2014OmnibusEquityIncentivePlanMember
Expiration period from date of grant for options granted 7 years
Restricted stock [Member] | 2014 Omnibus Equity Incentive Plan [Member] | Maximum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 4 years
Restricted stock [Member] | 2014 Omnibus Equity Incentive Plan [Member] | Minimum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 3 years
Stock options [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Total unrecognized compensation expense , net of estimates forfeitures 11,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted-average vesting period over which unrecognized compensation expense will be recognized 2 years 1 month
Stock options [Member] | 2014 Omnibus Equity Incentive Plan [Member] | Maximum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 4 years
Stock options [Member] | 2014 Omnibus Equity Incentive Plan [Member] | Minimum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 3 years
Restricted Stock [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Total unrecognized compensation expense , net of estimates forfeitures 118,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted-average vesting period over which unrecognized compensation expense will be recognized 2 years
Restricted Stock [Member] | Maximum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 4 years
Restricted Stock [Member] | Minimum [Member]  
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 3 years