Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Potential shares of Cadence's common stock excluded
Potential common shares excluded from the computation of diluted earnings per share	196	1,830
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	1,386
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	138	245
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	58	199