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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Dec. 28, 2019	Apr. 29, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 25,499	$ 28,647
Adjustment to Vital River redemption value	2,341	0
Purchase of a 10% redeemable noncontrolling interest	0	(3,732)
Net income (loss) attributable to noncontrolling interests	2,599	(538)
Foreign currency translation	360	(493)
Ending balance	$ 30,799	$ 23,884
Citoxlab
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling interest ownership percentage			10.00%	10.00%

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- Definition

Temporary Equity, Increase (Decrease) To Noncontrolling Interest

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- Definition

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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- Definition

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

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
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Value of accretion of temporary equity to its redemption value during the period.

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Adjustments to temporary equity resulting from foreign currency translation adjustments.

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