CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 4,992	$ (134)
Defined benefit plans:
Net change in plan assets	3,084	(25)
Reclassification into other income (expense), net	120	70
Foreign currency translation loss	(1,116)	(27)
Tax effect		4
Other comprehensive income, net of tax	2,088	22
Comprehensive income (loss)	$ 7,080	$ (112)