SEGMENT INFORMATION (Details) $ in Thousands	2 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2018 reporting_segment	Dec. 31, 2018 operating_segment	Sep. 28, 2019 USD ($)	Jul. 29, 2018 USD ($)	Sep. 28, 2019 USD ($)	Jul. 29, 2018 USD ($)	Oct. 28, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments	3	3
Total net sales			$ 1,285,043	$ 548,525	$ 3,645,332	$ 1,426,943
Total operating income			95,560	54,501	149,126	86,355
Unallocated other expense, net			(56,293)	(4,437)	(170,894)	(37,690)
Income (loss) before income taxes			39,267	50,064	(21,768)	48,665
Total assets			5,708,456		5,708,456		$ 1,110,375
Commercial
Segment Reporting Information [Line Items]
Total net sales			464,906	548,525	1,370,152	1,426,943
Siding
Segment Reporting Information [Line Items]
Total net sales			315,799	0	840,601	0
Windows
Segment Reporting Information [Line Items]
Total net sales			504,338	0	1,434,579	0
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Total net sales			464,906	548,525	1,370,152	1,426,943
Total operating income			59,317	79,964	142,436	157,785
Total assets			1,013,517		1,013,517		1,024,433
Operating Segments | Siding
Segment Reporting Information [Line Items]
Total net sales			315,799	0	840,601	0
Total operating income			37,063	0	51,346	0
Total assets			2,395,916		2,395,916		0
Operating Segments | Windows
Segment Reporting Information [Line Items]
Total net sales			504,338	0	1,434,579	0
Total operating income			34,446	0	62,039	0
Total assets			2,100,574		2,100,574		0
Corporate
Segment Reporting Information [Line Items]
Total operating income			(35,266)	$ (25,463)	(106,695)	$ (71,430)
Total assets			$ 198,449		$ 198,449		$ 85,942