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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue by Product and Service Offering (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 478,477	$ 464,232	$ 469,129	$ 445,763	$ 466,789	$ 425,720	$ 434,055	$ 354,868	$ 1,857,601	$ 1,681,432	$ 1,363,302
RMS
Segment Reporting Information [Line Items]
Total revenue									493,615	494,037	470,411
DSA
Segment Reporting Information [Line Items]
Total revenue									980,022	836,593	612,173
Manufacturing
Segment Reporting Information [Line Items]
Total revenue									$ 383,964	$ 350,802	$ 280,718

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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