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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 28, 2020	Jun. 29, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019	Aug. 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			(1,278)	249
Foreign currency translation			396	(814)
Ending balance			24,033	28,345
Citoxlab
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Acquisition of noncontrolling interest			0	4,035
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%
Supplier
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Acquisition of noncontrolling interest			$ 0	$ 8,740
Noncontrolling interest ownership percentage					20.00%	20.00%

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