Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Earnings Per Share
Net income	$ 12,531	$ 19,265	$ 83,591
Shares used in computing basic earnings per share	43,775	43,346	43,159
Effect of dilutive securities:
Stock-based awards and convertible debt	597	944	885
Shares used in computing diluted earnings per share	44,372	44,290	44,044
Earnings per share:
Basic (in dollars per share)	$ 0.29	$ 0.44	$ 1.94
Diluted (in dollars per share)	$ 0.28	$ 0.43	$ 1.90
Shares attributable to dilutive effect of conversion of debt securities	200	400	100