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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Segment Reporting Information [Line Items]
Restructuring costs	$ 2,331	$ 1,580	$ 4,690	$ 10,489
Unallocated corporate
Segment Reporting Information [Line Items]
Restructuring costs	0	36	(151)	36
RMS
Segment Reporting Information [Line Items]
Restructuring costs	0	(33)	7	727
DSA
Segment Reporting Information [Line Items]
Restructuring costs	815	1,074	2,449	7,572
Manufacturing
Segment Reporting Information [Line Items]
Restructuring costs	$ 1,516	$ 503	$ 2,385	$ 2,154

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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