Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Earnings Per Share
Net income	$ 61,494	$ 29,586	$ 38,021
Shares used in computing basic earnings per share	41,713	42,309	42,970
Effect of dilutive securities:
Stock options and other stock-based awards (in shares)	663	636	823
Shares used in computing diluted earnings per share	42,376	42,945	43,793
Earnings per share:
Basic (in dollars per share)	$ 1.47	$ 0.70	$ 0.88
Diluted (in dollars per share)	$ 1.45	$ 0.69	$ 0.87
Shares excluded from computation of diluted earning per share	100	100	100