Fair Value Measurement, Financial Instruments And Risk Management (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended	9 Months Ended
	Sep. 25, 2011 USD ($)	Sep. 26, 2010 USD ($)	Sep. 25, 2011 USD ($)	Sep. 26, 2010 USD ($)	Dec. 26, 2010 USD ($)	Sep. 25, 2011 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Dec. 26, 2010 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Sep. 25, 2011 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Sep. 25, 2011 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Sep. 25, 2011 Foreign Currency Revenue Forecast Contracts [Member] EUR (€)	Dec. 26, 2010 Foreign Currency Revenue Forecast Contracts [Member] USD ($)
Notional amount of derivatives								$ 24,300,000	$ 24,300,000	€ 17,300,000
Notional amount of derivatives not designated as hedging instruments						21,300,000
Assets	1,429,000		1,429,000		965,000	570,000	27,000	859,000	859,000		938,000
Liabilities	345,000		345,000		298,000	253,000	20,000	92,000	92,000		278,000
Unrealized loss recorded in other comprehensive income, net of tax	1,814,000	(2,059,000)	52,000	77,000	679,000				400,000
Tax of unrealized loss recorded in other comprehensive Income									100,000
Reclassification of unrealized loss on foreign currency hedge to earning within 12 months	200,000		200,000
Reclassification of unrealized loss on foreign currency hedge to earning within 12 months, tax			44,000
Expense related to foreign currency hedges recorded in cost of goods sold								700,000	1,200,000
Hedge ineffectiveness								$ 0	$ 100,000