Basic And Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,800	2,900	3,200	2,800
Net income per share - diluted (in dollars per share)	$ 0.06	$ (0.14)	$ (0.01)	$ (0.38)
Net income per share - basic (in dollars per share)	$ 0.06	$ (0.14)	$ (0.01)	$ (0.38)
Denominator:
Basic weighted-average shares outstanding (in shares)	27,780	28,320	27,799	28,265
Effect of dilutive employee stock options and restricted stock units (in shares)	200	0	0	0
Diluted weighted-average shares outstanding (in shares)	27,980	28,320	27,799	28,265
Numerator:
Net loss	$ 1,539	$ (3,890)	$ (148)	$ (10,861)