Revenue (Details)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	100.00%	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%	24.00%	22.00%
Digital IC Design and Signoff [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	29.00%	29.00%	29.00%
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%	27.00%
System Interconnect and Analysis [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	9.00%	9.00%	10.00%
IP [Member]
Revenue from External Customer [Line Items]
Percentage of product and maintenance revenue by product group	13.00%	12.00%	12.00%