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SEGMENT INFORMATION - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 743,300	$ 667,951	$ 2,132,943	$ 1,930,088
RMS
Segment Reporting Information [Line Items]
Total revenue	151,910	132,546	414,455	405,772
DSA
Segment Reporting Information [Line Items]
Total revenue	461,177	420,079	1,342,424	1,179,793
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	$ 130,213	$ 115,326	$ 376,064	$ 344,523

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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.

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-Publisher FASB
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