Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	149	2,662	843	1,755
Long-term performance-based stock awards
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	105	1,386	510	279
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	23	0	258	476
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	21	1,276	75	1,000