CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 92,054	$ 55,356	$ 231,862	$ 71,009
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	487	563	1,270	(9,715)
Foreign currency translation adjustments	(5,441)	16,418	(5,641)	9,300
Comprehensive income	$ 87,100	$ 72,337	$ 227,491	$ 70,594