Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 20,697	$ 20,464	$ 58,736	$ 49,031
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	515	1,934	(81)	2,455
Unrealized gain (loss) on available-for-sale securities	2	(98)	(139)	(279)
Amortization of defined benefit pension items:
Net actuarial loss	0	18	0	55
Prior service cost	0	4	0	13
Defined benefit pension plan adjustments	0	22	0	68
Other comprehensive loss, net of tax	(513)	(2,010)	(58)	(2,666)
Comprehensive income	$ 20,184	$ 18,454	$ 58,678	$ 46,365