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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Aug. 28, 2019	Jun. 13, 2019	Apr. 29, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 28,647	$ 18,525
Adjustment to Vital River redemption value	0	1,451
Purchase of Vital River 5% equity interest	(2,379)	(1,870)
Acquisition of non-controlling interest	(3,732)	0
Net loss attributable to noncontrolling interests	(852)	(42)
Foreign currency translation	1,436	(221)
Ending balance	25,499	28,647
Supplier
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquisition of non-controlling interest	0	8,740
Non-controlling interest percentage acquired			20.00%		20.00%
Vital River
Increase (Decrease) in Temporary Equity [Roll Forward]
Purchase of Vital River 5% equity interest	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
Additional equity interest percentage purchased				5.00%
Non-controlling interest percentage acquired				8.00%
Citoxlab
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquisition of non-controlling interest	$ 0	$ 4,035
Non-controlling interest percentage acquired		10.00%			10.00%

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

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