Other Comprehensive Earnings (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Other Comprehensive Earnings (Thousands of Dollars) [Abstract]
Foreign currency translation adjustments	$ (42,789)	$ 36,331	$ (9,767)	$ (20,033)
Gain (loss) on cash flows from hedging activities, net of tax	20,755	(34,933)	(16,585)	(4,502)
Reclassifications to earnings, net of tax:
Net losses (gains) on cash flow hedging activities	2,900	(6,080)	3,238	(10,975)
Other comprehensive loss	(19,134)	(4,682)	(23,114)	(35,510)
Deferred gains on hedging instruments, net of tax	2,085		2,085
Net deferred gains to be reclassified to earnings within the next twelve months	$ 4,700		$ 4,700