Acquisitions - Schedule of Fair Value of Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Oct. 25, 2021	Feb. 01, 2021	Jan. 25, 2021	Feb. 01, 2020	Jan. 01, 2022	Jan. 02, 2021
Business Acquisition [Line Items]
Goodwill					$ 364,598	$ 329,695
Anlin Windows & Doors [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 10,803
Inventories	7,633
Contract assets, net	7,027
Prepaid expenses and other assets	1,626
Property and equipment	22,800
Operating lease right-of-use asset	3,450
Intangible assets	77,800
Goodwill	5,596
Total assets acquired	136,735
Accounts payable	(5,175)
Accrued and other liabilities	(7,993)
Operating lease liability	(3,450)
Total liabilities assumed	(16,618)
Fair value of consideration transferred	120,117
Purchase price	113,500
Cash	114,196
Contingent consideration	5,921
Total fair value of consideration	$ 120,117
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Accounts receivable				$ 8,434
Inventories				2,936
Contract assets, net				4,413
Prepaid expenses and other assets				1,756
Property and equipment				7,433
Operating lease right-of-use asset				10,578
Intangible assets				27,370
Goodwill				52,094
Accounts payable				(6,621)
Accrued and other liabilities				(7,447)
Operating lease liability				(10,578)
Purchase price				90,368
Cash				90,368
Due to Sellers				200
Total fair value of consideration				90,368
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Accounts receivable				10,294
Inventories				3,757
Contract assets, net				4,413
Prepaid expenses and other assets				1,756
Property and equipment				7,423
Operating lease right-of-use asset				10,578
Intangible assets				28,670
Goodwill				46,200
Accounts payable				(6,621)
Accrued and other liabilities				(5,524)
Operating lease liability				(10,578)
Purchase price				90,368
Cash				90,145
Due to Sellers				223
Total fair value of consideration				90,368
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Adjustments to Allocation [Member]
Business Acquisition [Line Items]
Accounts receivable				(1,860)		1,900
Inventories				(821)		800
Property and equipment				10
Intangible assets				(1,300)		1,300
Goodwill				5,894		$ 5,900
Accrued and other liabilities				(1,923)
Cash				223
Due to Sellers				$ (223)
ECO [Member]
Business Acquisition [Line Items]
Accounts receivable		$ 4,790
Inventories		7,044
Contract assets, net		4,189
Prepaid expenses and other assets		947
Property and equipment		23,818
Operating lease right-of-use asset		26,815
Intangible assets		74,300
Goodwill		25,584
Total assets acquired		167,487
Accounts payable		(6,925)
Accrued and other liabilities, including customer deposits		(4,819)
Operating lease liability		(26,815)
Total liabilities assumed		(38,559)
Net assets acquired		128,928
Redeemable non-controlling interest		(28,464)
Fair value of consideration transferred		100,464
Cash		94,356	$ 94,400
PGTI common stock		6,108
Total fair value of consideration		100,464	$ 100,500
ECO [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Accounts receivable		5,031
Inventories		7,728
Contract assets, net		4,312
Prepaid expenses and other assets		1,706
Property and equipment		24,009
Operating lease right-of-use asset		27,864
Intangible assets		72,700
Goodwill		30,051
Total assets acquired		173,401
Accounts payable		(6,809)
Accrued and other liabilities, including customer deposits		(4,215)
Operating lease liability		(27,864)
Total liabilities assumed		(38,888)
Net assets acquired		134,513
Redeemable non-controlling interest		34,084
Fair value of consideration transferred		100,429
Cash		94,321
PGTI common stock		6,108
Total fair value of consideration		100,429
ECO [Member] | Adjustments to Allocation [Member]
Business Acquisition [Line Items]
Accounts receivable		(241)
Inventories		(684)
Contract assets, net		(123)
Prepaid expenses and other assets		(759)
Property and equipment		(191)
Operating lease right-of-use asset		(1,049)
Intangible assets		1,600
Goodwill		(4,467)
Total assets acquired		(5,914)
Accounts payable		(116)
Accrued and other liabilities, including customer deposits		(604)
Operating lease liability		1,049
Total liabilities assumed		329
Net assets acquired		(5,585)
Redeemable non-controlling interest		5,620
Fair value of consideration transferred		35
Cash		35
Total fair value of consideration		$ 35