Net Income (Loss) Per Share - Computation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2015	Sep. 30, 2015	Jul. 01, 2015	Apr. 01, 2015	Dec. 31, 2014	Sep. 24, 2014	Jun. 25, 2014	Mar. 26, 2014	Dec. 30, 2015	Dec. 31, 2014	Dec. 25, 2013
Numerator:
Net income (loss)	$ 5,367	$ 4,666	$ 7,230	$ 6,791	$ 4,575	$ 25,849	$ 6,569	$ 5,470	$ 24,054	$ 42,463	$ (16,873)
Denominator:
Weighted-average shares outstanding—Basic	38,284,435	38,275,317	37,812,767	37,424,745	37,149,379	34,221,829	28,715,485	28,712,622	37,949,316	32,285,484	28,712,622
Weighted-average shares outstanding—Diluted	38,965,248	39,107,241	39,085,206	38,921,884	39,691,650	36,821,095	30,372,281	30,157,316	39,039,558	34,346,241	28,712,622
Net income (loss) per share—Basic	$ 0.14	$ 0.12	$ 0.19	$ 0.18	$ 0.12	$ 0.76	$ 0.23	$ 0.19	$ 0.63	$ 1.32	$ (0.59)
Net income (loss) per share—Diluted	$ 0.14	$ 0.12	$ 0.18	$ 0.17	$ 0.12	$ 0.70	$ 0.21	$ 0.18	$ 0.62	$ 1.24	$ (0.59)
Anti-dilutive securities not considered in diluted EPS calculation									214,411	5,865	1,709,748