GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Amortization of intangible assets	$ 64,830,000	41,370,000	$ 41,699,000
Client relationships | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Business
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Decrease in intangible assets resulting from divestiture of business		16,800,000
Backlog | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Business
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Decrease in intangible assets resulting from divestiture of business		$ 300,000