Stock Compensation Plans and Stock Based Compensation (Details 9) - Employee stock purchase plans [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Shares of common stock issued under employee stock purchase plan
Cadence shares purchased under the ESPP	988	892	1,270
Cash received for the purchase of shares under the ESPP	$ 38,290	$ 29,160	$ 26,709
Weighted-average purchase price per share	$ 38.74	$ 32.69	$ 21.04