Revenue (Details)		3 Months Ended
		Apr. 03, 2021	Mar. 28, 2020
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		100.00%	100.00%
Custom Integrated Circuit (“IC”) Design and Simulation
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		23.00%	25.00%
Digital IC Design and Signoff
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		27.00%	29.00%
Functional Verification, including Emulation and Prototyping Hardware*
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	[1]	26.00%	23.00%
Intellectual Property (“IP”)
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		14.00%	14.00%
System Design and Analysis
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		10.00%	9.00%

[1] Includes immaterial amount of revenue accounted for under leasing arrangements.