Other Comprehensive Earnings (Loss), Changes in the components of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jun. 26, 2016	Jul. 02, 2017	Jun. 26, 2016
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			$ (194,570)	$ (146,001)
Other Comprehensive Earnings (Loss), Net of Tax, Total	$ (29,442)	$ (9,948)	(32,043)	(28,300)
Total accumulated other comprehensive earnings (loss), End of Period	(226,613)	(174,301)	(226,613)	(174,301)
Pension and Postretirement Amounts [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(118,401)	(102,931)
Other Comprehensive Earnings (Loss), Net of Tax, Total			2,897	2,350
Total accumulated other comprehensive earnings (loss), End of Period	(115,504)	(100,581)	(115,504)	(100,581)
Gains (Losses) On Derivative Instruments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			51,085	79,317
Other Comprehensive Earnings (Loss), Net of Tax, Total			(63,981)	(51,968)
Total accumulated other comprehensive earnings (loss), End of Period	(12,896)	27,349	(12,896)	27,349
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	(17,620)		(17,620)
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	4,724		4,724
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			1,424	1,258
Other Comprehensive Earnings (Loss), Net of Tax, Total			229	1,353
Total accumulated other comprehensive earnings (loss), End of Period	1,653	2,611	1,653	2,611
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(128,678)	(123,645)
Other Comprehensive Earnings (Loss), Net of Tax, Total			28,812	19,965
Total accumulated other comprehensive earnings (loss), End of Period	$ (99,866)	$ (103,680)	$ (99,866)	$ (103,680)