Condensed Consolidated Statements of Stockholders' Equity and Redeemable Non-controlling Interest - USD ($) $ in Thousands	Total	Common Stock	Treasury	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard, net of taxes	$ (228)					$ (228)
Beginning Balance (in shares) at Dec. 28, 2018		38,881,000	890,000
Beginning Balance at Dec. 28, 2018	321,205	$ 38	$ (13,754)	$ 116,019	$ (784)	219,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding (in shares)		180,000
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding	(1,229)			(1,229)
Stock-based compensation expense	1,729			1,729
Foreign currency translation adjustment	(159)				(159)
Net income	18,103					18,103
Ending Balance (in shares) at Mar. 29, 2019		39,061,000	890,000
Ending Balance at Mar. 29, 2019	339,421	$ 38	$ (13,754)	116,519	(943)	237,561
Beginning Balance at Dec. 28, 2018	14,282
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income	299
Ending Balance at Mar. 29, 2019	14,581
Beginning Balance (in shares) at Dec. 28, 2018		38,881,000	890,000
Beginning Balance at Dec. 28, 2018	321,205	$ 38	$ (13,754)	116,019	(784)	219,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	155
Net income	41,024
Ending Balance (in shares) at Jun. 28, 2019		39,274,000	890,000
Ending Balance at Jun. 28, 2019	369,180	$ 38	$ (13,754)	123,043	(629)	260,482
Beginning Balance at Dec. 28, 2018	14,282
Ending Balance at Jun. 28, 2019	15,022
Beginning Balance (in shares) at Mar. 29, 2019		39,061,000	890,000
Beginning Balance at Mar. 29, 2019	339,421	$ 38	$ (13,754)	116,519	(943)	237,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding (in shares)		115,000
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding	(2,264)			(2,264)
Issuance of stock for business acquisition (in shares)		98,000
Issuance of stock for business acquisition	7,167			7,167
Stock-based compensation expense	1,621			1,621
Foreign currency translation adjustment	314				314
Net income	22,921					22,921
Ending Balance (in shares) at Jun. 28, 2019		39,274,000	890,000
Ending Balance at Jun. 28, 2019	369,180	$ 38	$ (13,754)	123,043	(629)	260,482
Beginning Balance at Mar. 29, 2019	14,581
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income	441
Ending Balance at Jun. 28, 2019	$ 15,022
Beginning Balance (in shares) at Jan. 03, 2020	38,559	39,448,000	890,000
Beginning Balance at Jan. 03, 2020	$ 422,200	$ 39	$ (13,754)	123,274	150	312,491
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding (in shares)		45,000
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding	(2,047)			(2,047)
Stock-based compensation expense	1,921			1,921
Foreign currency translation adjustment	(940)				(940)
Net income	8,250					8,250
Ending Balance (in shares) at Apr. 03, 2020		39,493,000	890,000
Ending Balance at Apr. 03, 2020	429,706	$ 39	$ (13,754)	123,470	(790)	320,741
Beginning Balance at Jan. 03, 2020	15,719
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income	488
Ending Balance at Apr. 03, 2020	$ 16,207
Beginning Balance (in shares) at Jan. 03, 2020	38,559	39,448,000	890,000
Beginning Balance at Jan. 03, 2020	$ 422,200	$ 39	$ (13,754)	123,274	150	312,491
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(17)
Net income	$ 20,858
Ending Balance (in shares) at Jul. 03, 2020	41,438	42,327,000	890,000
Ending Balance at Jul. 03, 2020	$ 633,064	$ 41	$ (13,754)	321,479	133	325,165
Beginning Balance at Jan. 03, 2020	15,719
Ending Balance at Jul. 03, 2020	24,975
Beginning Balance (in shares) at Apr. 03, 2020		39,493,000	890,000
Beginning Balance at Apr. 03, 2020	429,706	$ 39	$ (13,754)	123,470	(790)	320,741
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding (in shares)		74,000
Issuance of common stock under equity compensation plans, net of shares repurchased for income tax withholding	(2,301)			(2,301)
Issuance of common stock, net (in shares)		2,760,000
Issuance of common stock, net	198,236	$ 2		198,234
Stock-based compensation expense	2,076			2,076
Foreign currency translation adjustment	923			923
Net income	$ 12,608					12,608
Ending Balance (in shares) at Jul. 03, 2020	41,438	42,327,000	890,000
Ending Balance at Jul. 03, 2020	$ 633,064	$ 41	$ (13,754)	$ 321,479	$ 133	325,165
Beginning Balance at Apr. 03, 2020	16,207
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income	584
Ending Balance at Jul. 03, 2020	24,975
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to the fair value of non-controlling interest	(8,184)					$ (8,184)
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Adjustment to fair value of non-controlling interest	$ 8,184