RESTRUCTURING (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Oct. 03, 2020	Apr. 04, 2020	Oct. 03, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 2,918		$ 32,321
Total restructuring costs incurred to date	50,400		50,400
Asset impairment		$ 3,100	4,900
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		2,663	2,663	$ 2,418
Costs incurred			23,563	9,658
Cash payments			(21,245)	(9,413)
Restructuring reserve, ending balance	4,981		4,981	2,663
Equipment Costs
Restructuring Cost and Reserve [Line Items]
Asset impairment			3,400
Right-of-Use Assets
Restructuring Cost and Reserve [Line Items]
Asset impairment			1,500
Restructuring and Impairment Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs			32,100
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring costs			200
Windows
Restructuring Cost and Reserve [Line Items]
Restructuring costs			7,200
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		418	418	0
Costs incurred			3,389	1,094
Cash payments			(3,368)	(676)
Restructuring reserve, ending balance	439		439	418
Siding
Restructuring Cost and Reserve [Line Items]
Restructuring costs			2,900
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		482	482	85
Costs incurred			2,367	1,834
Cash payments			(2,169)	(1,437)
Restructuring reserve, ending balance	680		680	482
Commercial
Restructuring Cost and Reserve [Line Items]
Restructuring costs			20,400
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		0	0	0
Costs incurred			16,413	2,721
Cash payments			(14,314)	(2,721)
Restructuring reserve, ending balance	2,099		2,099	0
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring gain			1,800
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		$ 1,763	1,763	2,333
Costs incurred			1,394	4,009
Cash payments			(1,394)	(4,579)
Restructuring reserve, ending balance	1,763		1,763	$ 1,763
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,074		23,563
Asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,169		4,938
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 675		$ 3,820