Revenue (Details)		3 Months Ended
		Mar. 28, 2020	Mar. 30, 2019
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		100.00%	100.00%
Custom IC Design and Simulation [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		25.00%	25.00%
Digital IC Design and Signoff [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		29.00%	30.00%
Functional Verification, including Emulation and Prototyping Hardware [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	[1]	23.00%	24.00%
IP [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		14.00%	12.00%
System Interconnect and Analysis [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group		9.00%	9.00%

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