Segment Reporting (Details 1) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Americas:
Total Americas	$ 198,259	$ 199,355
Total long-lived assets	248,165	251,342
United States [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	197,760	198,744
Other Americas [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	499	611
Asia [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	36,408	37,678
EMEA [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	12,724	13,615
Japan [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	$ 774	$ 694