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v3.21.1

Leases (Details Textual) $ in Thousands | Jan. 02, 2021 USD ($)
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Leases [Abstract] |
Operating lease obligations, leasing arrangements to commence in a future period | $ 5,900

X
- Definition Operating lease obligations related to leases commencing at a future date. + References No definition available. + Details
Name: | cdns_LeaseObligationsToCommenceInTheNextFiscalQuarter
Namespace Prefix: | cdns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration