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BUSINESS ACQUISITIONS - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Jun. 29, 2019 | Apr. 29, 2019 | Dec. 29, 2018 | Apr. 03, 2018 | Jan. 11, 2018
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,526,682 |  | $ 1,247,133 |  |
Citoxlab |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Trade receivables, contractual amount |  | $ 35,547 |  |  |
Trade receivables |  | 35,547 |  |  |
Inventories |  | 5,282 |  |  |
Other current assets (excluding cash) |  | 14,687 |  |  |
Property, plant and equipment |  | 93,326 |  |  |
Goodwill |  | 275,076 |  |  |
Definite-lived intangible assets |  | 161,100 |  |  |
Other long-term assets |  | 20,465 |  |  |
Deferred revenue |  | (14,647) |  |  |
Current liabilities |  | (46,118) |  |  |
Deferred tax liabilities |  | (28,467) |  |  |
Other long-term liabilities |  | (20,487) |  |  |
Redeemable noncontrolling interest |  | (4,035) |  |  |
Total purchase price allocation |  | 491,729 |  |  |
MPI Research |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Trade receivables, contractual amount |  |  |  | $ 35,073 |
Trade receivables |  |  |  | 35,073 |
Inventories |  |  |  | 4,463 |
Other current assets (excluding cash) |  |  |  | 5,893 |
Property, plant and equipment |  |  |  | 128,403 |
Goodwill |  |  |  | 441,656 |
Definite-lived intangible assets |  |  |  | 309,200 |
Other long-term assets |  |  |  | 1,081 |
Deferred revenue |  |  |  | (23,926) |
Current liabilities |  |  |  | (32,885) |
Deferred tax liabilities |  |  |  | (65,945) |
Other long-term liabilities |  |  |  | (2,213) |
Total purchase price allocation |  | $ 491,700 |  | $ 800,800 |
KWS BioTest Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Trade receivables, contractual amount |  |  |  |  | $ 1,309
Trade receivables |  |  |  |  | 1,309
Other current assets (excluding cash) |  |  |  |  | 99
Property, plant and equipment |  |  |  |  | 1,136
Goodwill |  |  |  |  | 17,660
Definite-lived intangible assets |  |  |  |  | 3,647
Deferred revenue |  |  |  |  | (151)
Current liabilities |  |  |  |  | (1,575)
Other long-term liabilities |  |  |  |  | (596)
Total purchase price allocation |  |  |  |  | $ 21,529

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