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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Segment Reporting Information [Line Items]
Restructuring costs	$ 1,609	$ 8,351	$ 2,358	$ 8,909
Unallocated corporate
Segment Reporting Information [Line Items]
Restructuring costs	0	0	(151)	0
RMS
Segment Reporting Information [Line Items]
Restructuring costs	0	769	7	759
DSA
Segment Reporting Information [Line Items]
Restructuring costs	1,074	6,186	1,633	6,498
Manufacturing
Segment Reporting Information [Line Items]
Restructuring costs	$ 535	$ 1,396	$ 869	$ 1,652

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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-Name Accounting Standards Codification
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