Benefit Plans - Summarizes The Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 35	$ 40	$ 107	$ 120
Interest cost	38	48	114	144
Expected return on plan assets	(58)	(64)	(180)	(192)
Amortization of net loss	9		19
Net periodic benefit cost	$ 24	$ 24	$ 60	$ 72