Net Income Per Share (Details 1) - shares shares in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	2,183	977	532
Long-term market-based awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	1,097	50	152
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	359	637	303
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	727	290	77