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BUSINESS ACQUISITIONS - Narrative (Details) £ in Millions				3 Months Ended				6 Months Ended
	Apr. 29, 2019 USD ($)	Apr. 03, 2018 USD ($)	Jan. 11, 2018 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Mar. 30, 2019 GBP (£)	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 29, 2018 USD ($)	Sep. 29, 2018 GBP (£)	Mar. 26, 2018 USD ($)	Jan. 11, 2018 GBP (£)
Credit facility | $2.3 Billion Credit Facility
Business Acquisition [Line Items]
Credit facility												$ 2,300,000,000
Citoxlab
Business Acquisition [Line Items]
Purchase price	$ 528,100,000
Purchase price allocation	491,729,000
Goodwill, amount expected to be deductible for tax purposes	$ 7,200,000
Integration related costs and transaction costs				$ 12,100,000				$ 17,200,000
Actual revenue from acquiree				30,900,000
Actual earnings from acquiree				2,000,000.0
Weighted average amortization life of intangible assets acquired	12 years
Citoxlab | Client relationships
Business Acquisition [Line Items]
Weighted average amortization life of intangible assets acquired	13 years
MPI Research
Business Acquisition [Line Items]
Purchase price		$ 829,700,000
Purchase price allocation	$ 491,700,000	800,800,000
Cash acquired	$ 36,400,000	27,700,000
Goodwill, amount expected to be deductible for tax purposes		4,100,000
Integration related costs and transaction costs				0			$ 11,700,000	$ 0	$ 14,500,000
Adjustments related to prior period		$ 1,200,000
Weighted average amortization life of intangible assets acquired		12 years
MPI Research | Client relationships
Business Acquisition [Line Items]
Weighted average amortization life of intangible assets acquired		13 years
KWS BioTest Limited
Business Acquisition [Line Items]
Purchase price			$ 20,300,000
Purchase price allocation			21,529,000
Cash acquired			1,000,000.0
Integration related costs and transaction costs				$ 0			$ 0		500,000
Adjustments related to prior period			$ 400,000
Undiscounted contingent payments										$ 2,600,000	£ 2.0		£ 3.0
Payments for contingent liabilities					$ 2,600,000	£ 2.0
KWS BioTest Limited | Client relationships
Business Acquisition [Line Items]
Weighted average amortization life of intangible assets acquired								12 years
Depreciation and Amortization Expense | Citoxlab
Business Acquisition [Line Items]
Adjustments related to prior period								$ 4,000,000.0	5,100,000
Depreciation and Amortization Expense | MPI Research
Business Acquisition [Line Items]
Adjustments related to prior period									9,400,000
Interest expense | Citoxlab
Business Acquisition [Line Items]
Adjustments related to prior period								$ 1,200,000	2,000,000.0
Interest expense | MPI Research
Business Acquisition [Line Items]
Adjustments related to prior period									$ 2,800,000

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