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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Impairment charge		1,900,000
Amortization of intangible assets	41,370,000	$ 41,699,000	$ 24,229,000
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

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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