Other Comprehensive Earnings (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Details of other comprehensive earnings (loss) [Abstract]
Foreign currency translation adjustments	$ (21,844)	$ (32,457)	$ 23,782
Changes in value of available-for-sale securities, net of tax	0	0	504
Gain (loss) on cash flow hedging activities, net of tax	(8,689)	10,444	(24,446)
Changes in unrecognized pension and postretirement amounts, net of tax	(20,237)	(1,812)	8,356
Reclassifications to earnings, net of tax:
Net (gains) losses on cash flow hedging activities	3,338	(15,422)	(18,657)
Loss on available-for-sale securities	0	0	147
Amortization of unrecognized pension and postretirement amounts	3,340	(11,235)	6,689
Other comprehensive loss	(44,092)	(50,482)	(3,625)
Net losses on cash flow hedging activities reclassified to earnings as a result of hedge ineffectiveness, net of tax	100	109	679
Tax benefit of other comprehensive earnings items	8,581	5,327	1,322
Income tax expense (benefit) related to reclassification adjustments from other comprehensive earnings	(1,571)	8,767	(331)
Deferred gains on hedging instruments expected to be reclassified to consolidated statement of operations within the next 12 months	8,307
Components of accumulated other comprehensive income [Abstract]
Foreign currency translation adjustments	40,798	62,642
Gain on cash flow hedging activities, net of tax	10,081	15,432
Unrecognized pension and postretirement amounts, net of tax	(86,822)	(69,925)
Total accumulated other comprehensive earnings	$ (35,943)	$ 8,149