Acquisitions - Summary of Unaudited Proforma Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Net sales	$ 890,373	$ 831,610
Net income	$ 45,338	$ 44,925
Net income per common share:
Basic	$ 0.77	$ 0.77
Diluted	$ 0.76	$ 0.76
Western Window Systems [Member]
Business Acquisition [Line Items]
Net sales			$ 775,473
Net income			$ 50,407
Net income per common share:
Basic			$ 0.96
Diluted			$ 0.93