Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Unaudited Quarterly Financial Information [Abstract]
Net sales	$ 151,618	$ 122,645	$ 119,294	$ 129,483	$ 125,927	$ 138,045	$ 143,842	$ 146,851	$ 523,040	$ 554,665	$ 508,045
Gross profit	52,716	46,943	44,719	51,850	47,427	52,119	56,227	56,509	196,228	212,282	192,683
Operating income (loss)	10,400	18,343	16,702	(10,033)	18,772	19,138	26,373	25,832	35,412	90,115	75,554
Income (loss) before income taxes	7,156	16,362	13,544	(13,015)	16,861	15,462	21,925	21,059	24,047	75,307	56,395
Net income (loss)	$ 5,551	$ 12,982	$ 12,908	$ (17,223)	$ 13,809	$ 12,791	$ 17,265	$ 16,404	$ 14,218	$ 60,268	$ 46,730
Basic and diluted net income per common share	$ 0.17	$ 0.40	$ 0.40	$ (0.54)	$ 0.43	$ 0.40	$ 0.54	$ 0.51	$ 0.44	$ 1.88	$ 1.49