Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014
Numerator:
Net income (loss)	$ (4,811)	$ 1,078	$ (8,462)	$ (41,394)
Denominator:
Weighted average shares used to compute net income(loss) per share-basic	87,991	90,618	88,359	94,113
Effect of dilutive securities from stock options, restricted stock units and ESPP	0	1,182	0	0
Weighted average shares used to compute net income(loss) per share-diluted	87,991	91,800	88,359	94,113
Net income (loss) per share:
Basic	$ (0.05)	$ 0.01	$ (0.10)	$ (0.44)
Diluted	$ (0.05)	$ 0.01	$ (0.10)	$ (0.44)