Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	336	149	313	843
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	105	0	510
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	23	267	258
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	5	21	46	75