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v3.20.2

Subsequent Events (Details) - Subsequent Event [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 26, 2020 | Jan. 02, 2021
Subsequent Event [Line Items] |  |
Expected income tax benefit | $ 19 |
Expected increase in income tax resulting from change in tax law |  | $ 7

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- Definition Expected income tax benefit + References No definition available. + Details
Name: | cdns_ExpectedIncomeTaxBenefit
Namespace Prefix: | cdns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Expected increase in income tax resulting from change in tax law + References No definition available. + Details
Name: | cdns_ExpectedIncreaseInIncomeTaxResultingFromChangeInTaxLaw
Namespace Prefix: | cdns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |