CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,913	$ 14,048	$ 4,968
Defined benefit plans:
Net change in plan assets	(3,639)	(2,265)	(498)
Reclassification into other income (expense), net	283	107	101
Foreign currency translation gain	717	291	242
Tax effect	142	139	(15)
Other comprehensive loss, net of tax	(2,497)	(1,728)	(170)
Comprehensive income	$ 3,416	$ 12,320	$ 4,798