Net Income Per Share (Details 1) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	112	1,417	652	1,773
Long-term performance-based stock awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	100	1,250	186	1,008
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	0	160	404	729
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	12	7	62	36