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Geographic And Service Group Information (Geographic Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 27, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 52,604 $ 57,916 $ 58,961 $ 54,349 $ 55,042 $ 55,647 $ 57,964 $ 54,083 $ 223,830 $ 222,736 $ 209,063
North America [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 179,539 173,650 158,836
International Primarily European Countries [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 44,291 $ 49,086 $ 50,227