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SEGMENT INFORMATION - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 682,584	$ 657,568	$ 1,389,643	$ 1,262,137
RMS
Segment Reporting Information [Line Items]
Total revenue	116,549	136,054	262,545	273,226
DSA
Segment Reporting Information [Line Items]
Total revenue	442,564	405,517	881,247	759,714
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	$ 123,471	$ 115,997	$ 245,851	$ 229,197

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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