Geographic And Service Group Information (Geographic Revenue) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Jan. 02, 2015	Dec. 27, 2013	Dec. 28, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 60,343	$ 60,437	$ 61,052	$ 54,905	$ 52,604	$ 57,916	$ 58,961	$ 54,349	$ 236,737	$ 223,830	$ 222,736
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									190,050	179,539	173,650
International Primarily European Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									$ 46,687	$ 44,291	$ 49,086