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REVENUE - Recurring vs. Up-front Revenue (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Timing of Goods or Service, Percent	100.00%	100.00%	100.00%
Transferred over Time
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Timing of Goods or Service, Percent	83.00%	84.00%	85.00%
Transferred over Time | Revenue arrangement recognized over time
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Timing of Goods or Service, Percent	80.00%	81.00%	83.00%
Transferred over Time | Revenue arrangement with non-cancelable commitments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Timing of Goods or Service, Percent	3.00%	3.00%	2.00%
Transferred at Point in Time
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Timing of Goods or Service, Percent	17.00%	16.00%	15.00%

X

- Definition

Revenue from Contract with Customer, Timing of Goods or Service, Percent

+ References

No definition available.

+ Details

Name:	cdns_RevenueFromContractWithCustomerTimingOfGoodsOrServicePercent
Namespace Prefix:	cdns_
Data Type:	dtr-types1: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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cdns_ArrangementTypeAxis=cdns_RevenueArrangementRecognizedOverTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cdns_ArrangementTypeAxis=cdns_RevenueArrangementWithNonCancelableCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: