Other Comprehensive Earnings (Loss), Changes in the components of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			$ (146,001)	$ (95,454)
Other Comprehensive Earnings (Loss), Net of Tax, Total	$ (9,948)	$ (16,480)	(28,300)	(8,022)
Total accumulated other comprehensive earnings (loss), End of Period	(174,301)	(103,476)	(174,301)	(103,476)
Pension and Postretirement Amounts [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(102,931)	(113,092)
Other Comprehensive Earnings (Loss), Net of Tax, Total			2,350	2,497
Total accumulated other comprehensive earnings (loss), End of Period	(100,581)	(110,595)	(100,581)	(110,595)
Gains (Losses) On Derivative Instruments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			79,317	43,689
Other Comprehensive Earnings (Loss), Net of Tax, Total			(51,968)	35,209
Total accumulated other comprehensive earnings (loss), End of Period	27,349	78,898	27,349	78,898
Gains (Losses) On Derivative Instruments [Member] | Interest Rate Contract [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), End of Period	(18,789)		(18,789)
Gains (Losses) On Derivative Instruments [Member] | Foreign Exchange Forward [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), End of Period	46,138		46,138
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			1,258	1,900
Other Comprehensive Earnings (Loss), Net of Tax, Total			1,353	941
Total accumulated other comprehensive earnings (loss), End of Period	2,611	2,841	2,611	2,841
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(123,645)	(27,951)
Other Comprehensive Earnings (Loss), Net of Tax, Total			19,965	(46,669)
Total accumulated other comprehensive earnings (loss), End of Period	$ (103,680)	$ (74,620)	$ (103,680)	$ (74,620)