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BUSINESS COMBINATIONS AND DIVESTITURE - Additional Information (Details) € in Millions, £ in Millions |  |  |  |  |  |  | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jan. 03, 2020 USD ($) | Aug. 28, 2019 USD ($) | Apr. 29, 2019 USD ($) | Apr. 03, 2018 USD ($) | Jan. 11, 2018 USD ($) | Aug. 04, 2017 USD ($) | Jun. 29, 2019 USD ($) | Apr. 01, 2017 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Sep. 29, 2018 EUR (€) | Sep. 29, 2018 USD ($) | Jan. 11, 2018 GBP (£) | Aug. 04, 2017 EUR (€) | Aug. 04, 2017 USD ($) | Feb. 10, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on divestiture |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 10,577,000 |  |  |  |  |  |
CDMO Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000
Cash and cash equivalents transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000
Working capital adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000
Gain on divestiture |  |  |  |  |  |  |  | $ 10,600,000 |  |  |  |  |  |  |  |  |  |  |
Citoxlab |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 527,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  | $ 20,700,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  | 491,007,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  | 36,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from transaction |  |  | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  |  |  |  |  | 123,700,000 |  |  |  |  |  |  |  |  |  |
Operating income (loss) since acquisition |  |  |  |  |  |  |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Citoxlab | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Citoxlab | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  | 5,700,000 | 9,400,000 |  |  |  |  |  |  |
Citoxlab | Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 4,100,000 |  |  |  |  |  |  |
MPI Research |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 829,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  |  |  | 0 | 16,500,000 |  |  |  |  |  |  |
Purchase price allocation |  |  |  | 800,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  | 27,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from transaction |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  |  |  |  |  |  | $ 209,500,000 |  |  |  |  |  |  |  |  |
Operating income (loss) since acquisition |  |  |  |  |  |  |  |  |  | $ 33,400,000 |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MPI Research | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MPI Research | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  |  | 14,100,000 | 22,400,000 |  |  |  |  |  |
MPI Research | Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 27,100,000 |  |  |  |  |  |
KWS BioTest Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 20,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  |  |  | $ 0 | 700,000 |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  | 21,529,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | € 2.0 | $ 2,600,000 | £ 3.0 |  |  |
KWS BioTest Limited | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |
Brains On-Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 21,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 2,600,000 |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,122,000 |
Cash acquired |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 6.7 |  |
Weighted average life |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration paid |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Brains On-Line | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 23,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |
Purchase price allocation |  | 23,063,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of pre-existing relationship for supply agreement |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest |  | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplier | Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | HemaCare Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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