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RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Segment Reporting Information [Line Items]
Restructuring costs	$ 12,594	$ 13,839	$ 9,551
Total reportable segments | RMS
Segment Reporting Information [Line Items]
Restructuring costs	845	3,110	1,983
Total reportable segments | DSA
Segment Reporting Information [Line Items]
Restructuring costs	8,605	7,307	1,063
Total reportable segments | Manufacturing
Segment Reporting Information [Line Items]
Restructuring costs	2,733	3,032	1,227
Unallocated corporate
Segment Reporting Information [Line Items]
Restructuring costs	$ 411	$ 390	$ 5,278

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.

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