Revenue (Details)	3 Months Ended
	Mar. 30, 2019		Mar. 31, 2018
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	100.00%		100.00%
Functional Verification, including Emulation and Prototyping Hardware [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	24.00%	[1]	26.00%
Digital IC Design and Signoff [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	30.00%		30.00%
Custom IC Design and Simulation [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	25.00%		26.00%
System Interconnect and Analysis [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	9.00%		9.00%
IP [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	12.00%		9.00%

[1] Includes immaterial amount of revenue accounted for under Topic 842.