Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	592	845
Long-term performance-based stock awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	228	150
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	242	416
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	122	279