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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019	Jun. 13, 2019	Apr. 29, 2019
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Beginning balance	$ 28,647		$ 28,647	$ 18,525
Acquisition of noncontrolling interest			(3,732)	0
Purchase of Vital River 5% equity interest	$ 2,379	$ 1,870	0	(8,745)
Change in fair value of Vital River 8% equity interest, included in additional-paid-in-capital			0	2,708
Modification of Vital River 8% purchase option			0	2,196
Net (loss) income attributable to noncontrolling interests			(538)	284
Foreign currency translation			(493)	(35)
Ending balance		$ 20,479	23,884	20,479
Citoxlab
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Acquisition of noncontrolling interest			0	4,095
Noncontrolling interest ownership percentage					10.00%		10.00%
Vital River
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Adjustment to Vital River redemption value (three months ended March 30, 2019)			$ 0	$ 1,451
Additional equity interest percentage acquired						5.00%
Noncontrolling interest ownership percentage			8.00%			8.00%

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

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