Segment Information (Details) $ in Thousands	12 Months Ended
	Jan. 02, 2021 USD ($) product segment	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Segment Information
Number of operating segments | segment	1
Number of product categories | product	2
Revenues	$ 886,677	$ 837,554	$ 868,267
Property and equipment, net	139,439	135,939
United States
Segment Information
Revenues	92,136	110,451	149,385
Property and equipment, net	128,204	126,572
China
Segment Information
Revenues	397,751	354,855	344,255
Rest of world
Segment Information
Revenues	396,790	372,248	$ 374,627
Property and equipment, net	$ 11,235	$ 9,367