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SEGMENT INFORMATION - Revenue Per Significant Product or Service (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]
Total revenue	$ 914,607	$ 682,584	$ 1,739,173	$ 1,389,643
RMS
Segment Reporting Information [Line Items]
Total revenue	176,694	116,549	353,604	262,545
DSA
Segment Reporting Information [Line Items]
Total revenue	540,094	442,564	1,041,272	881,247
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	$ 197,819	$ 123,471	$ 344,297	$ 245,851

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- 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.

+ References

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-Publisher FASB
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