GOODWILL AND INTANGIBLE ASSETS - Useful Life of Assets (Details)	12 Months Ended
	Dec. 27, 2020
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	16 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	20 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	3 years