Other Comprehensive Earnings (Loss), Changes in the components of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 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	$ (8,179)	$ (29,688)	(40,222)	(57,988)
Total accumulated other comprehensive earnings (loss), End of Period	(234,792)	(203,989)	(234,792)	(203,989)
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			4,345	3,523
Total accumulated other comprehensive earnings (loss), End of Period	(114,056)	(99,408)	(114,056)	(99,408)
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			(85,966)	(80,956)
Total accumulated other comprehensive earnings (loss), End of Period	(34,881)	(1,639)	(34,881)	(1,639)
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	(17,332)		(17,332)
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	17,547		17,547
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			(555)	963
Total accumulated other comprehensive earnings (loss), End of Period	869	2,221	869	2,221
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			41,954	18,482
Total accumulated other comprehensive earnings (loss), End of Period	$ (86,724)	$ (105,163)	$ (86,724)	$ (105,163)