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Comprehensive Income (Narrative) (Details) (USD $)
Sep. 24, 2011
Dec. 25, 2010
Comprehensive Income  
Accumulated other comprehensive income as reported as a component of equity$ 1,198,000$ 881,000
Unrealized net gain on the translation of the financial statements559,000 
Cumulative unrealized holding gains on available-for-sale investments, net of income taxes$ 639,000