Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2019	Jun. 27, 2018	Jun. 26, 2019	Jun. 27, 2018
Numerator:
Net income	$ 14,087	$ 5,052	$ 15,000	$ 7,581
Denominator:
Weighted-average shares outstanding—basic (shares)	37,939,912	38,482,074	38,296,807	38,473,641
Weighted-average shares outstanding—diluted (shares)	38,580,722	39,043,434	39,043,477	39,015,259
Net income (loss) per share—basic (usd per share)	$ 0.37	$ 0.13	$ 0.39	$ 0.20
Net income (loss) per share—diluted (usd per share)	$ 0.37	$ 0.13	$ 0.38	$ 0.19
Anti-dilutive securities not considered in diluted EPS calculation (shares)	733,449	570,774	438,547	570,774