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BUSINESS ACQUISITIONS - Narrative (Details) $ in Thousands, £ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Aug. 28, 2019 USD ($) | Apr. 29, 2019 USD ($) | Apr. 03, 2018 USD ($) | Jan. 11, 2018 USD ($) | Sep. 28, 2019 USD ($) | Mar. 30, 2019 USD ($) | Mar. 30, 2019 GBP (£) | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 29, 2018 GBP (£) | Jan. 11, 2018 GBP (£)
Citoxlab |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 527,700 |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  | 491,007 |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 36,700 |  |  |  |  |  |  |  |  |  |
Goodwill, amount expected to be deductible for tax purposes |  | $ 7,200 |  |  |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  | $ 1,900 |  |  |  | $ 19,100 |  |  |
Actual revenue from acquiree |  |  |  |  | 44,000 |  |  |  | 74,900 |  |  |
Operating income from acquiree |  |  |  |  | 200 |  |  |  | 2,200 |  |  |
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 |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  | 800,800 |  |  |  |  |  |  |  |  |
Cash acquired |  |  | 27,700 |  |  |  |  |  |  |  |  |
Goodwill, amount expected to be deductible for tax purposes |  |  | 4,100 |  |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  | 0 |  |  | $ 800 | 0 | $ 15,300 |  |
Adjustments related to prior period |  |  | $ 1,200 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  | 21,529 |  |  |  |  |  |  |  |
Cash acquired |  |  |  | 1,000 |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  | 0 |  |  | 100 | $ 0 | 600 |  |
Adjustments related to prior period |  |  |  | $ 400 |  |  |  |  |  |  |  |
Undiscounted contingent payments |  |  |  |  |  |  |  | $ 2,600 |  | 2,600 | £ 2.0 | £ 3.0
Payments for contingent liabilities |  |  |  |  |  | $ 2,600 | £ 2.0 |  |  |  |  |
KWS BioTest Limited | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  |  |  |  |  |  |  | 12 years |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 23,400 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation | 23,063 |  |  |  |  |  |  |  |  |  |  |
Cash acquired | 300 |  |  |  |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  | $ 2,100 |  |  |  | $ 3,200 |  |  |
Prepayments for future purchases and other post-closing adjustments | $ 4,000 |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense | Citoxlab |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  |  | 4,800 | 7,300 |  |
Depreciation and Amortization Expense | MPI Research |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  |  |  | 11,800 |  |
Interest Expense | Citoxlab |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  |  | $ 1,200 | 3,100 |  |
Interest Expense | MPI Research |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  |  |  | $ 2,800 |  |
Supplier |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 80.00% |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |
Supplier | Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 80.00% |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage | 20.00% |  |  |  |  |  |  |  |  |  |  |

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