Geographic and Group Information (Long-Lived Assets Attributable To Geographic Areas) (Details) - USD ($) $ in Thousands	Apr. 02, 2021	Jan. 01, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 106,993	$ 107,713
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	88,562	89,087
International (Primarily European Countries) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 18,431	$ 18,626