Consolidated Statements of Comprehensive Earnings (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 13,433	$ 60,299	$ 40,160	$ (52,193)
Other comprehensive earnings (loss):
Foreign currency translation adjustments	3,334	(50,627)	10,327	(37,798)
Unrealized holding gains (losses) on available-for-sale securities, net of tax	290	87	555	(56)
Net (losses) gains on cash flow hedging activities, net of tax	(2,079)		4,513
Net (losses) gains on cash flow hedging activities, net of tax		43,712		18,442
Changes in unrecognized pension amounts, net of tax	19,589	0	19,589	(26,058)
Reclassifications to earnings (loss), net of tax:
Net (gains) losses on cash flow hedging activities	(1,982)		(4,796)
Net (gains) losses on cash flow hedging activities		1,635		6,990
Amortization of unrecognized pension and postretirement amounts	4,160	2,512	5,299	4,332
Settlement of U.S. defined benefit plan	85,852	0	85,852	0
Total other comprehensive earnings (loss), net of tax	109,164	(2,681)	121,339	(34,148)
Comprehensive earnings (loss)	$ 122,597	$ 57,618	$ 161,499	$ (86,341)