Segment and Geographic Information (Property and Equipment, Net by Country) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	$ 49,481	$ 51,852
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	30,532	25,615
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	10,617	14,998
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	4,928	3,948
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	2,310	3,677
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	215	1,470
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	637	1,211
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	242	933
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, less accumulated depreciation of $134,786 at December 31, 2016 and $118,943 at January 2, 2016	$ 18,949	$ 26,237