Other Comprehensive Earnings (Loss), Changes in the components of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			$ (239,425)	$ (194,570)
Adoption of ASU 2018-02			(21,503)
Other Comprehensive Earnings (Loss), Net of Tax, Total	$ (2,681)	$ (29,442)	(34,148)	(32,043)
Total accumulated other comprehensive earnings (loss), End of Period	(295,076)	(226,613)	(295,076)	(226,613)
Pension and Postretirement Amounts [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(110,971)	(118,401)
Adoption of ASU 2018-02			(18,065)
Other Comprehensive Earnings (Loss), Net of Tax, Total			(21,726)	2,897
Total accumulated other comprehensive earnings (loss), End of Period	(150,762)	(115,504)	(150,762)	(115,504)
Gains (Losses) On Derivative Instruments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(32,827)	51,085
Adoption of ASU 2018-02			(3,660)
Other Comprehensive Earnings (Loss), Net of Tax, Total			25,432	(63,981)
Total accumulated other comprehensive earnings (loss), End of Period	(11,055)	(12,896)	(11,055)	(12,896)
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	(20,008)		(20,008)
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	8,953		8,953
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			1,034	1,424
Adoption of ASU 2018-02			222
Other Comprehensive Earnings (Loss), Net of Tax, Total			(56)	229
Total accumulated other comprehensive earnings (loss), End of Period	1,200	1,653	1,200	1,653
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive (Loss) [Line Items]
Total accumulated other comprehensive earnings (loss), Beginning of Year			(96,661)	(128,678)
Adoption of ASU 2018-02			0
Other Comprehensive Earnings (Loss), Net of Tax, Total			(37,798)	28,812
Total accumulated other comprehensive earnings (loss), End of Period	$ (134,459)	$ (99,866)	$ (134,459)	$ (99,866)