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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Segment Reporting Information [Line Items]
Revenue	$ 464,232	$ 425,720	$ 1,379,124	$ 1,214,643
Operating segments | RMS
Segment Reporting Information [Line Items]
Revenue	122,020	120,928	373,183	369,325
Operating segments | DSA
Segment Reporting Information [Line Items]
Revenue	246,946	215,817	726,796	594,859
Operating segments | Manufacturing
Segment Reporting Information [Line Items]
Revenue	$ 95,266	$ 88,975	$ 279,145	$ 250,459

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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