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. 23, 2012 USD ($)	Sep. 25, 2011 USD ($)	Sep. 23, 2012 USD ($)	Sep. 25, 2011 USD ($)	Dec. 25, 2011 USD ($)	Sep. 23, 2012 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Dec. 25, 2011 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Sep. 23, 2012 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Sep. 23, 2012 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Sep. 23, 2012 Foreign Currency Revenue Forecast Contracts [Member] EUR (€)	Dec. 25, 2011 Foreign Currency Revenue Forecast Contracts [Member] USD ($)
Fair Value Disclosures [Line Items]
Notional amount of derivatives not designated as hedging instruments						$ 13,700,000
Assets	206,000		206,000		1,583,000	36,000	463,000	170,000	170,000		1,120,000
Liabilities	339,000		339,000		415,000	339,000	415,000	0	0		0
Notional amount of derivatives								7,200,000	7,200,000	5,400,000
Unrealized gain recorded in other comprehensive income	(799,000)	1,814,000	(801,000)	52,000	1,165,000				900,000
Tax of unrealized loss recorded in other comprehensive Income									40,000
Unrealized loss from cash flow hedge expected to be reclassified to earnings over the next 12 months	900,000		900,000
Unrealized loss from cash flow hedge reclassified to earnings, tax			40,000
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net								500,000	1,300,000
Hedge ineffectiveness	$ 0		$ 40,000