Fair Value Measurement, Financial Instruments And Risk Management (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended			3 Months Ended	6 Months Ended
	Jun. 24, 2012 USD ($)	Jun. 26, 2011 USD ($)	Jun. 24, 2012 USD ($)	Jun. 26, 2011 USD ($)	Dec. 25, 2011 USD ($)	Jun. 24, 2012 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Dec. 25, 2011 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Jun. 24, 2012 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Jun. 24, 2012 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Jun. 24, 2012 Foreign Currency Revenue Forecast Contracts [Member] EUR (€)	Dec. 25, 2011 Foreign Currency Revenue Forecast Contracts [Member] USD ($)
Fair Value Disclosures [Line Items]
Notional amount of derivatives not designated as hedging instruments						$ 6,500,000
Assets	1,049,000		1,049,000		1,583,000	119,000	463,000	930,000	930,000		1,120,000
Liabilities	40,000		40,000		415,000	40,000	415,000	0	0		0
Notional amount of derivatives								13,500,000	13,500,000	10,000,000
Unrealized gain recorded in other comprehensive income	590,000	57,000	(2,000)	(1,762,000)	1,165,000				1,700,000
Tax of unrealized loss recorded in other comprehensive Income									82,000
Unrealized loss from cash flow hedge expected to be reclassified to earnings over the next 12 months	1,700,000		1,700,000
Unrealized loss from cash flow hedge reclassified to earnings, tax			82,000
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net								400,000	800,000
Hedge ineffectiveness			$ 40,000