Geographic And Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) (USD $)	Sep. 26, 2014	Dec. 27, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 100,284,000	$ 90,341,000
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	84,204,000	74,095,000
International Primarily European Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 16,080,000	$ 16,246,000