Geographic and Service Group Information (Geographic Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Jan. 01, 2016	Jan. 02, 2015	Dec. 27, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 60,261	$ 59,992	$ 59,423	$ 54,905	$ 54,551	$ 54,550	$ 55,000	$ 49,418	$ 260,940	$ 236,737	$ 223,830
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									218,719	190,050	179,539
International Primarily European Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									$ 42,221	$ 46,687	$ 44,291