Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	2,011	1,519	1,302	1,183
Long-term performance-based stock awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	1,386	0	807	75
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	596	701	419	559
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	29	818	76	549