CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 206,340	$ (92,217)	$ 465,484	$ (22,522)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,415	21,443	(15,923)	(13,012)
Derivative financial instruments	(502)	(6,309)	17,028	(26,154)
Pension and postretirement benefit plans	13,587	11,958	27,175	23,917
Total other comprehensive loss, net of tax	14,500	27,092	28,280	(15,249)
Comprehensive income (loss)	$ 220,840	$ (65,125)	$ 493,764	$ (37,771)