Derivatives - Gains (Losses) on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	$ 1,569	$ (1,229)	$ (4,357)
Aluminum Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	1,037	(1,229)	(4,357)
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	2,470	$ 5,030	$ 239
MTP Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	532
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	$ (111)