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Receivables, net (Details Textual) - Customer | Dec. 28, 2019 | Dec. 29, 2018
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Receivables and Allowances for Doubtful Accounts (Textual) [Abstract] |  |
Number of customers with receivables balance greater than ten percent of total balance | 0 | 1
Percent of receivables attributable to single customer | 10.00% | 11.00%

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- Definition Accounts receivable and allowances for doubtful accounts. + References No definition available. + Details
Name: | cdns_AccountsReceivableAndAllowancesForDoubtfulAccountsTextualAbstract
Namespace Prefix: | cdns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of customers with accounts receivable and installment contract receivable balance greater than ten percent of total balance. + References No definition available. + Details
Name: | cdns_NumberOfCustomersWithAccountsReceivableAndInstallmentContractReceivableBalanceGreaterThanTenPercentOfBalance
Namespace Prefix: | cdns_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of Company's receivables net and installment contract receivables net attributable to single customer. + References No definition available. + Details
Name: | cdns_PercentageOfCompanysReceivablesNetAndInstallmentContractReceivablesNetAttributableToSingleCustomer
Namespace Prefix: | cdns_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant