Net Income Per Share (Details 1) - shares shares in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	532	1,677	1,089
Long-term performance-based awards
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	152	1,069	0
Options to purchase shares of common stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	303	581	1,029
Non-vested shares of restricted stock
Potential shares of Cadence's common stock excluded
Total potential common shares excluded	77	27	60