Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 227,719	$ 224,615	$ 229,262	$ 221,625	$ 229,097	$ 212,786	$ 209,573	$ 208,148	$ 903,221	$ 859,604	$ 802,957
Income from operations	43,409	42,790	44,999	45,042	47,048	41,633	40,989	38,931	176,240	168,601	146,157
Net income	$ 21,967	$ 27,008	$ 28,437	$ 29,187	$ 28,701	$ 26,695	$ 25,982	$ 24,671	$ 106,599	$ 106,049	$ 92,329
Diluted earnings per share	$ 0.65	$ 0.80	$ 0.83	$ 0.85	$ 0.83	$ 0.77	$ 0.75	$ 0.71	$ 3.13	$ 3.07	$ 2.60