Revenue Recognition and Contracts with Customers - Revenue Based on Business Unit, Product Category, and Market (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 221,601	$ 238,033	$ 202,783	$ 220,204	$ 174,826	$ 197,823	$ 198,570	$ 173,737	$ 882,621	$ 744,956	$ 698,493
Southeast Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales									752,432	606,631	648,792
Western Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales									130,189	138,325	49,701
Net sales									130,200	138,400	49,700
Impact-Resistant Windows and Door Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales									630,200	516,100	561,800
Non-Impact Window and Door Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales									252,400	228,900	136,700
New Construction [Member]
Disaggregation Of Revenue [Line Items]
Net sales									402,500	368,400	283,100
Repair and Remodel [Member]
Disaggregation Of Revenue [Line Items]
Net sales									$ 480,100	$ 376,600	$ 415,400