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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Aug. 28, 2019	Jun. 13, 2019	Apr. 29, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 18,525	$ 16,609
Modification of Vital River 8% purchase option
Adjustment to Vital River redemption value	1,451	1,111
Purchase of Vital River 5% equity interest	(8,745)	0
Change in fair value of Vital River 8% equity interest, included in additional-paid-in-capital	2,708	0
Modification of Vital River 8% purchase option	2,196	0
Net income attributable to noncontrolling interests	249	543
Foreign currency translation	(814)	(932)
Ending balance	28,345	17,331
Vital River
Modification of Vital River 8% purchase option
Additional equity interest percentage purchased				5.00%
Noncontrolling interest ownership percentage				8.00%
Citoxlab
Modification of Vital River 8% purchase option
Acquisition of non-controlling interest	4,035	0
Noncontrolling interest ownership percentage					10.00%
Supplier
Modification of Vital River 8% purchase option
Acquisition of non-controlling interest	$ 8,740	$ 0
Noncontrolling interest ownership percentage			20.00%		20.00%

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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