Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	784	1,467
Long-term performance-based stock awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	232	635
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	391	749
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	161	83