Defined Benefit Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2019	Mar. 30, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	[1]	$ 232	$ 138
Interest cost		20	14
Expected return on plan assets		(33)	(26)
Net amortization of transitional obligation	[2]		3
Prior service credit	[2]	(6)	(6)
Actuarial loss recognized in current period	[2]	32	28
Net periodic pension cost		$ 245	$ 151

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

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