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SEGMENT INFORMATION - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 824,566	$ 707,059
RMS
Segment Reporting Information [Line Items]
Total revenue	176,910	145,996
DSA
Segment Reporting Information [Line Items]
Total revenue	501,178	438,683
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	$ 146,478	$ 122,380

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.

+ References

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-Publisher FASB
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- Definition

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