Segment Reporting (Details 1) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Summary of long-lived assets by geography
Total long-lived assets	$ 288,163	$ 275,855
United States [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	231,937	220,023
Other Americas [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	748	728
Americas [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	232,685	220,751
China [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	16,315	15,729
Other Asia [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	27,234	27,890
Asia [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	43,549	43,619
EMEA [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	11,194	10,474
Japan [Member]
Summary of long-lived assets by geography
Long-lived assets in individual foreign countries	$ 735	$ 1,011