Revenue from Contracts with Customers - Net Change in Estimate (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021 USD ($) project	Jun. 28, 2020 USD ($) project	Jul. 04, 2021 USD ($) project	Jun. 28, 2020 USD ($) project
Revenue from Contract with Customer [Abstract]
Increase (decrease) in revenue from net changes in transaction prices	$ 2,131	$ (308)	$ 2,131	$ (308)
Increase (decrease) in revenue from net changes in input cost estimates	(2,084)	1,082	(2,084)	(51)
Net increase (decrease) in revenue from net changes in estimates	$ 47	$ 774	$ 47	$ (359)
Number of projects | project	3	1	3	2
Net change in estimate as a percentage of aggregate revenue for associated projects	0.60%	11.50%	0.60%	(0.30%)