Other Comprehensive Earnings (Loss), Changes in the components of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 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	(18,352)	8,458
Total accumulated other comprehensive earnings (loss), End of Period	(164,353)	(86,996)
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	1,175	1,204
Total accumulated other comprehensive earnings (loss), End of Period	(101,756)	(111,888)
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	(33,347)	54,339
Total accumulated other comprehensive earnings (loss), End of Period	45,970	98,028
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	(19,076)
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	65,046
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	1,680	226
Total accumulated other comprehensive earnings (loss), End of Period	2,938	2,126
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	12,140	(47,311)
Total accumulated other comprehensive earnings (loss), End of Period	$ (111,505)	$ (75,262)