Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	406	550	302	1,191
Long-term market-based awards
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	0	40	0	713
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	331	506	235	376
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	75	4	67	102