Basic And Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Apr. 04, 2015	Oct. 01, 2016	Oct. 03, 2015
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,800	3,200	3,100	2,300
Net income per share - diluted (in dollars per share)	$ 0.20	$ (0.22)		$ 0.25	$ (0.23)
Net income per share - basic (in dollars per share)	$ 0.20	$ (0.22)		$ 0.26	$ (0.23)
Denominator:
Basic weighted-average shares outstanding (in shares)	27,108	27,248		27,005	27,661
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	272	0		278	0
Diluted weighted-average shares outstanding (in shares)	27,380	27,248		27,283	27,661
Numerator:
Net income (loss)	$ 5,457	$ (6,099)		$ 6,913	$ (6,247)