Net Income (Loss) Per Share - Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Numerator:
Net income (loss)	$ 75,085	$ 10,051	$ (10,732)
Shares used in computation — basic:
Weighted average common shares outstanding	33,409	32,632	31,564
Shares used in computation — diluted:
Weighted average common shares outstanding	33,409	32,632	31,564
Dilutive effect of common shares outstanding subject to repurchase	878	485
Dilutive effect of options outstanding	16	33
Shares used in computing diluted net income (loss) per share	34,303	33,150	31,564
Net income (loss) per share — basic	$ 2.25	$ 0.31	$ (0.34)
Net income (loss) per share — diluted	$ 2.19	$ 0.30	$ (0.34)