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Stock Compensation Plans and Stock Based Compensation (Details 6) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Restricted Stock [Member]
 
Summary of changes in restricted stock awards outstanding under Cadence's equity incentive plans  
Unvested shares as of December 28, 2013 10,113us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Granted 5,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Vested (4,719)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Forfeited (783)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unvested shares as of January 3, 2015 10,451us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Unvested shares as of December 28, 2013, Weighted-Average Grant Date Fair Value $ 13.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Granted, Weighted-Average Grant date Fair Value $ 16.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Vested, Weighted-Average Grant Date Fair Value $ 12.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Forfeited, Weighted-Average Grant Date Fair Value $ 13.94cdns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unvested shares as of January 3, 2015, Weighted-Average Grant Date Fair Value $ 15.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Unvested shares expected to vest after January 3, 2015 9,846cdns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedSharesExpectedToVestNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unvested shares expected to vest after January 3, 2015, Weighted-Average Grant Date Fair Value $ 15.47cdns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedSharesExpectedToVestWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unvested shares as of January 3, 2015, Weighted-Average Remaining Vesting Terms 1 year 1 month
Unvested shares expected to vest after January 3, 2015, Weighted-Average Remaining Vesting Terms 1 year 1 month
Unvested shares as of January 3, 2015, Aggregate Intrinsic Value $ 196,801cdns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicMonetaryValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unvested shares expected to vest after January 3, 2015, Aggregate Intrinsic Value $ 185,398cdns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedSharesExpectedToVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember