Fair Value Measurement, Financial Instruments And Risk Management (Narrative) (Details)	3 Months Ended		12 Months Ended			3 Months Ended
	Mar. 25, 2012 USD ($)	Mar. 27, 2011 USD ($)	Dec. 25, 2011 USD ($)	Mar. 25, 2012 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Dec. 25, 2011 Foreign Currency Forward Exchange Contracts [Member] USD ($)	Mar. 25, 2012 Foreign Currency Revenue Forecast Contracts [Member] USD ($)	Mar. 25, 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						$ 24,000,000	€ 17,600,000
Notional amount of derivatives not designated as hedging instruments				9,600,000
Assets	578,000		1,583,000	5,000	463,000	573,000		1,120,000
Liabilities	62,000		415,000	33,000	415,000	29,000
Unrealized gain recorded in other comprehensive income	(592,000)	(1,819,000)	1,165,000			1,100,000
Tax of unrealized loss recorded in other comprehensive Income						19,000
Unrealized loss from cash flow hedge reclassified to earnings	1,100,000
Unrealized loss from cash flow hedge reclassified to earnings, tax	19,000
Expense related to foreign currency hedges recorded in cost of goods sold						400,000
Hedge ineffectiveness	$ 40,000