Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended								5 Months Ended	12 Months Ended
	Feb. 01, 2020	Aug. 13, 2018	Jan. 02, 2021	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Business Acquisition [Line Items]
Goodwill			$ 329,695				$ 277,600					$ 329,695	$ 277,600
Net sales			221,601	$ 238,033	$ 202,783	$ 220,204	174,826	$ 197,823	$ 198,570	$ 173,737		882,621	744,956	$ 698,493
Net income			9,987	$ 17,322	$ 2,199	$ 15,600	$ 3,280	$ 15,106	$ 17,045	$ 8,257		45,108	43,688	$ 53,933
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Business combination, effective date of acquisition	Feb. 01, 2020
Fair value of consideration	$ 90,368
Cash payment to acquire business	90,368
Additional payments owe to seller	200
Business combination, acquisition related costs	2,400											900	1,500
Goodwill	52,094
Decrease in acquired accounts receivable	8,434
Decrease in commercial trade name	27,370
Decrease in commercial inventories	2,936
Net increase in the purchase price	200
Net sales												93,900
Net income												2,000
Goodwill deductible for tax purposes			52,100									52,100
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Accrued Liabilities [Member]
Business Acquisition [Line Items]
Adjustments to accrued liabilities			1,900									1,900
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Adjustments to Allocation [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	223
Additional payments owe to seller	(223)
Goodwill	5,894		5,900									5,900
Decrease in acquired accounts receivable	(1,860)		1,900									1,900
Decrease in commercial trade name	(1,300)		1,300									1,300
Decrease in commercial inventories	(821)		$ 800									800
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Premium [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	3,200
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Cash On Hand [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	37,200
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | 2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	53,200
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | 2018 Senior Notes due 2026 [Member] | Add-on Issuance [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	$ 50,000
Western Window Systems [Member]
Business Acquisition [Line Items]
Business combination, effective date of acquisition		Aug. 13, 2018
Fair value of consideration		$ 354,584
Cash payment to acquire business		354,584
Business combination, acquisition related costs		4,400										700	700
Goodwill		169,541
Decrease in acquired accounts receivable		7,338
Decrease in commercial trade name		167,000
Decrease in commercial inventories		12,580
Net increase in the purchase price		600
Net deferred tax liability		5,180
Goodwill deductible for tax purposes		$ 139,600
Net sales from acquisition											$ 49,700	$ 130,200	$ 138,300
Western Window Systems [Member] | Western Window Systems Blocker LLC [Member]
Business Acquisition [Line Items]
Ownership percentage acquired		18.06%
Western Window Systems [Member] | Adjustments to Allocation [Member]
Business Acquisition [Line Items]
Fair value of consideration		$ (629)
Cash payment to acquire business		(629)
Goodwill		5,162
Decrease in acquired accounts receivable		(217)
Net deferred tax liability		5,180
Western Window Systems [Member] | Cash On Hand [Member]
Business Acquisition [Line Items]
Cash payment to acquire business		39,600
Western Window Systems [Member] | 2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Cash payment to acquire business		$ 315,000