Net Income Per Share (Details 1) - shares shares in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	642	2,183	977
Long-term market-based awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	383	1,097	50
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	201	359	637
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	58	727	290