Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Dec. 28, 2019	Feb. 01, 2020
Lessee Lease Description [Line Items]
Operating lease existence of option to extend			true
Operating lease extension period			5 years
Operating lease existence of option to terminate			true
Operating lease not yet commenced description			no additional operating or finance leases that have not yet commenced
Finance lease not yet commenced description			no additional operating or finance leases that have not yet commenced
Lease expenses	$ 3,300	$ 2,300	$ 9,300	$ 6,600	$ 8,900
Operating lease right-of-use assets obtained in exchange for operating lease obligations	3,079		17,917
Operating lease right-of-use asset						$ 10,578
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Lessee Lease Description [Line Items]
Operating lease right-of-use asset	10,600		10,600
Cost of Sales [Member]
Lessee Lease Description [Line Items]
Lease expenses	$ 1,600	$ 1,000	$ 4,700	$ 3,000
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease term	1 year		1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease term	9 years		9 years
Operating lease termination period			1 year