Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 26,785	$ 28,543	$ 28,567	$ 32,970
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,001	(443)	521	(893)
Unrealized loss on available-for-sale securities	(181)	0	(181)	0
Amortization of defined benefit pension items:
Net actuarial loss	18	25	37	50
Prior service cost	4	12	9	24
Defined benefit pension plan adjustments	22	37	46	74
Other comprehensive income (loss), net of tax	(1,160)	480	(656)	967
Comprehensive income	$ 25,625	$ 29,023	$ 27,911	$ 33,937