Segment Information and Geographical Data (Long-Lived Assets Attributable To Geographic Areas) (Details) - USD ($) $ in Thousands	Jun. 27, 2025	Dec. 27, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 120,309	$ 115,531
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	103,268	100,676
Europe (U.K., Germany and Netherlands) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	15,798	14,247
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 1,243	$ 608