Defined Benefit Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 02, 2021	Apr. 03, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost	[1]	$ 348	$ 319
Interest cost	[2]	14	11
Expected return on plan assets	[2]	(99)	(43)
Prior service credit	[2],[3]	(11)	(9)
Actuarial loss recognized in current period	[2],[3]	131	79
Net periodic pension cost		$ 383	$ 357

[1] Recognized in selling general and administrative expenses on the Condensed Consolidated Statements of Operations.

[2] Recognized in other income (expense), net on the Condensed Consolidated Statements of Operations.

[3] Amounts reclassified from accumulated other comprehensive income (loss).