Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 431,548	$ 385,544
Other comprehensive loss before reclassification	1,569	(1,229)	$ (4,357)
Amounts reclassified from other comprehensive loss	2,359	5,030	239
Less: Income tax (expense) benefit	(970)	(974)	1,053
Other comprehensive income (loss), net of tax	2,958	2,827	(3,065)
Ending Balance	485,134	431,548	385,544
Accumulated Other Comprehensive Loss [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(238)	(3,065)
Other comprehensive income (loss), net of tax	2,958	2,827	(3,065)
Ending Balance	2,720	(238)	(3,065)
Aluminum Forward Contracts [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassification	1,037	(1,229)	(4,357)
Amounts reclassified from other comprehensive loss	2,470	5,030	239
Less: Income tax (expense) benefit	(866)	(974)	1,053
Other comprehensive income (loss), net of tax	2,641	2,827	(3,065)
Aluminum Forward Contracts [Member] | Accumulated Other Comprehensive Loss [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(238)	(3,065)
Ending Balance	2,403	$ (238)	$ (3,065)
MTP Contracts [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassification	532
Amounts reclassified from other comprehensive loss	(111)
Less: Income tax (expense) benefit	(104)
Other comprehensive income (loss), net of tax	317
MTP Contracts [Member] | Accumulated Other Comprehensive Loss [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	$ 317