Acquisition - Schedule of Fair Value of Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands		3 Months Ended
	Feb. 01, 2020	Oct. 03, 2020	Dec. 28, 2019
Business Acquisition [Line Items]
Accounts receivable	$ 8,655
Inventories	3,059
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	50,825	$ 328,425	$ 277,600
Accounts payable	(6,621)
Accrued and other liabilities	(6,522)
Operating lease liability	(10,578)
Purchase price	90,368
Cash	90,368
Total fair value of consideration	90,368
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Operating lease right-of-use asset		10,600
Goodwill	50,800
Due to Sellers	200	200
Total fair value of consideration	90,400
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	(1,639)	1,600
Inventories	(698)	700
Property and equipment	10
Intangible assets	(1,300)	1,300
Goodwill	4,625	$ 4,600
Accrued and other liabilities	(998)
Cash	223
Due to Sellers	$ (223)