Segments - Summary of Financial Data Attributable to Operating Segments (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
Net sales:
Total net sales	$ 221,601	$ 238,033	$ 202,783	$ 220,204	$ 174,826	$ 197,823	$ 198,570	$ 173,737	$ 882,621	$ 744,956	$ 698,493
Income from operations:
Total income from operations									84,711	84,056	95,109
Decrease due to impairment of WWS trade name									(8,000)
Restructuring costs and charges									(4,227)
Gains on sales of assets											2,551
Interest expense, net									27,719	26,417	26,529
Debt extinguishment costs										1,512	3,375
Total income before income taxes									56,992	56,127	65,205
Southeast Segment [Member]
Net sales:
Total net sales									752,432	606,631	648,792
Income from operations:
Total income from operations									85,794	75,484	89,053
Western Segment [Member]
Net sales:
Total net sales									130,189	138,325	49,701
Income from operations:
Total income from operations									$ 11,144	$ 8,572	$ 3,505