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SEGMENT INFORMATION - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 973,131	$ 914,607	$ 1,887,060	$ 1,739,173
RMS
Segment Reporting Information [Line Items]
Total revenue	186,410	176,694	362,952	353,604
DSA
Segment Reporting Information [Line Items]
Total revenue	591,917	540,094	1,136,176	1,041,272
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	$ 194,804	$ 197,819	$ 387,932	$ 344,297

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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