Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021 USD ($)	Sep. 26, 2020 USD ($)	Oct. 02, 2021 USD ($) segment	Sep. 26, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Depreciation and amortization	$ (1,878)	$ (1,667)	$ (5,655)	$ (5,305)
Interest expense	(1,347)	(1,880)	(152)	(7,095)
Restructuring costs	(1,798)	0	(1,798)	0
Change in fair value of contingent consideration	651	0	1,292	0
Impairments related to variable interest entity	0	0	(5,674)	0
(Loss) income before income taxes	(3,151)	8,338	12,238	12,773
Segment Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	(8,522)	(7,276)	(23,185)	(21,789)
Interest expense	(1,347)	(1,880)	(152)	(7,095)
Equity compensation	(5,938)	(7,390)	10,621	(619)
Restructuring costs	(1,798)	0	(1,798)	0
COVID-19 benefits, net	0	3,057	0	4,158
Succession and transition charges	0	(771)	(344)	(5,345)
Foreign currency impact	(17)	98	47	58
Acquisition and integration costs	(1,575)	0	(6,604)	0
Inventory step-up costs	0	0	(2,106)	0
Equity loss in unconsolidated investments	(419)	0	(1,320)	0
Change in fair value of contingent consideration	(651)	0	(1,292)	0
Impairments related to variable interest entity	0	0	(7,043)	0
Other non-recurring costs	(4,199)	(601)	(6,858)	(884)
U.S. Segment | Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	19,782	21,649	46,929	42,800
International Segment | Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	$ 1,533	$ 1,452	$ 5,343	$ 1,489