Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 29, 2018	$ 385,544	$ 607	$ 409,661	$ (3,065)	$ (8,900)	$ (12,759)
Begining Balance, Shares at Dec. 29, 2018		58,081,540
Grants of restricted stock		$ 6	(6)
Vesting of restricted stock, Shares		164,226
Forfeitures of restricted stock		$ (1)	1
Purchases of treasury stock	(6,055)					(6,055)
Purchases of treasury stock, Shares		(428,059)
Retirement of treasury stock			(505)			505
Stock-based compensation	3,923		3,923
Exercise of stock options	1,562	$ 7	1,555
Exercise of stock options, Shares		682,931
Common stock issued under ESPP	59		59
Common stock issued under ESPP, Shares		4,096
Net income	43,688				43,688
Other comprehensive income	2,827			2,827
Ending Balance at Dec. 28, 2019	431,548	$ 619	414,688	(238)	34,788	(18,309)
Ending Balance, Shares at Dec. 28, 2019		58,504,734
Grants of restricted stock		$ 7	(7)
Vesting of restricted stock, Shares		219,977
Forfeitures of restricted stock		$ (3)	3
Purchases of treasury stock	(815)					(815)
Purchases of treasury stock, Shares		(51,479)
Retirement of treasury stock		$ (1)	(814)			815
Stock-based compensation	5,458		5,458
Exercise of stock options	572	$ 3	569
Exercise of stock options, Shares		284,353
Common stock issued under ESPP	305		305
Common stock issued under ESPP, Shares		41,126
Net income	45,108				45,108
Other comprehensive income	2,958			2,958
Ending Balance at Jan. 02, 2021	485,134	$ 625	420,202	2,720	79,896	(18,309)
Ending Balance, Shares at Jan. 02, 2021		58,998,711
Grants of restricted stock		$ 7	(7)
Vesting of restricted stock, Shares		312,982
Forfeitures of restricted stock		$ (1)	1
Issuance of treasury stock					(20)	20
Issuance of treasury stock, Shares		4,600
Purchases of treasury stock	(1,648)					(1,648)
Purchases of treasury stock, Shares		(73,105)
Retirement of treasury stock		$ (1)	(1,372)		(275)	1,648
Stock-based compensation	7,819		7,819
Exercise of stock options	$ 138	$ 1	137
Exercise of stock options, Shares	67,797	67,797
Common stock issued under ESPP	$ 463		463
Common stock issued under ESPP, Shares		27,335
Issuance in acquisition of Eco	6,108	$ 4	6,104
Issuance in acquisition of Eco, Shares		357,797
Net income	32,878				32,878
Other comprehensive income	4,286			4,286
Change in redemption value of redeemable non-controlling interest	(6,081)				(6,081)
Ending Balance at Jan. 01, 2022	$ 529,097	$ 635	$ 433,347	$ 7,006	$ 106,398	$ (18,289)
Ending Balance, Shares at Jan. 01, 2022		59,696,117