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v3.21.1

Summary of Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019
Minimum [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue, as a percentage of total revenue, characterized as recurring | 85.00% |
Maximum [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue, as a percentage of total revenue, characterized as recurring |  | 90.00%

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- Definition Revenue which is recognized over time + References No definition available. + Details
Name: | cdns_RecurringRevenue
Namespace Prefix: | cdns_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |