BUSINESS ACQUISITIONS AND DIVESTITURE - Purchase Price Allocations (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Apr. 03, 2018	Jan. 11, 2018	Dec. 30, 2017	Aug. 04, 2017	Dec. 31, 2016	Sep. 28, 2016	Jun. 27, 2016	Apr. 04, 2016
Business Acquisition [Line Items]
Goodwill	$ 1,247,133			$ 804,906		$ 787,517
MPI Research
Business Acquisition [Line Items]
Acquired 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		$ 800,800
KWS BioTest Limited
Business Acquisition [Line Items]
Acquired 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
Brains On-Line
Business Acquisition [Line Items]
Acquired trade receivables, contractual amount			$ 1,146
Trade receivables					$ 1,146
Other current assets (excluding cash)					640
Property, plant and equipment					664
Goodwill					12,582
Definite-lived intangible assets					9,300
Other long-term assets					29
Deferred revenue					(405)
Current liabilities					(1,683)
Other long-term liabilities					(2,151)
Total purchase price allocation					$ 20,122
Agilux
Business Acquisition [Line Items]
Acquired trade receivables, contractual amount							$ 4,799
Trade receivables							4,799
Other current assets (excluding cash)							794
Property, plant and equipment							3,907
Goodwill							44,517
Definite-lived intangible assets							21,900
Other long-term assets							11
Current liabilities							(3,812)
Other long-term liabilities							(10,091)
Total purchase price allocation							$ 62,025
Blue Stream
Business Acquisition [Line Items]
Acquired trade receivables, contractual amount								$ 1,104
Trade receivables								1,104
Other current assets (excluding cash)								15
Property, plant and equipment								912
Goodwill								10,334
Definite-lived intangible assets								1,230
Other long-term assets								187
Current liabilities								(1,132)
Other long-term liabilities								(901)
Total purchase price allocation								$ 11,749
WIL Research
Business Acquisition [Line Items]
Acquired trade receivables, contractual amount									$ 48,625
Trade receivables									48,157
Inventories									2,296
Other current assets (excluding cash)									3,814
Property, plant and equipment									129,066
Goodwill									330,175
Definite-lived intangible assets									164,800
Other long-term assets									1,060
Deferred revenue									(39,103)
Current liabilities									(27,386)
Other long-term liabilities									(35,488)
Total purchase price allocation									$ 577,391