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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	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 (three months ended March 30, 2019)	1,451	0
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
Acquisition of a 10% non-controlling interest through acquiring Citoxlab	4,095	0
Net income attributable to noncontrolling interests	284	377
Foreign currency translation	(35)	(324)
Ending balance	$ 20,479	$ 16,662
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
Noncontrolling interest ownership percentage				10.00%

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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