GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017	Dec. 31, 2017
Intangible Assets [Line Items]
Goodwill and intangible asset impairment charges			$ 0	$ 0
Intangible assets	$ 396,417,000		396,417,000		$ 263,467,000
Amortization of intangible assets	8,873,000	$ 5,237,000	25,140,000	$ 14,239,000
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite lived intangible assets	82,200,000		82,200,000
Amortization of intangible assets			0
Customer Relationships and Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets	$ 314,200,000		$ 314,200,000
Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			4 years 8 months 12 days		4 years 73 days
Customer Relationships [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			10 years 37 days		10 years 2 months 12 days
Aluminum Metals Company [Member] | Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			3 years
Metal Moulding Corp, Indiana Marine Products, Collins & Company, Dehco Inc. and Dowco Inc. [Member] | Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			5 years
2018 Acquisitions [Member] | Customer Relationships [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			10 years
Minimum [Member] | Customer Relationships and Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			3 years
Maximum [Member] | Customer Relationships and Noncompete Agreements [Member]
Intangible Assets [Line Items]
Intangible assets, weighted average useful life			19 years