Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Consolidated Statements of Comprehensive Earnings (Loss) [Abstract]
Net earnings (loss)	$ 26,727	$ (112,492)
Other comprehensive earnings (loss):
Foreign currency translation adjustments	6,993	12,829
Net gains (losses) on cash flow hedging activities, net of tax	6,592	(25,270)
Unrealized holding gains (losses) on available-for-sale securities, net of tax	265	(143)
Changes in unrecognized pension and postretirement amounts, net of tax	0	(26,058)
Reclassifications to earnings (loss), net of tax:
Net (gains) losses on cash flow hedging activities	(2,814)	5,355
Amortization of unrecognized pension and postretirement amounts	1,139	1,820
Total other comprehensive loss, net of tax	12,175	(31,467)
Comprehensive earnings	$ 38,902	$ (143,959)