Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 139,082	$ 164,565	$ 119,519
Other comprehensive income (loss):
Pension and postemployment adjustments, net of tax	(8,087)	877	1,147
Unrealized loss on investments	0	0	(974)
Foreign currency translation adjustments	(812)	(25,338)	10,738
Comprehensive income	$ 130,183	$ 140,104	$ 130,430