Fair Value - Schedule of Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	$ 3,611	$ (317)
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	3,611	(317)
Aluminum Forward Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	3,190	(317)
Aluminum Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	3,190	$ (317)
MTP Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	421
MTP Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	$ 421