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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Segment Reporting Information [Line Items]
Revenue	$ 434,055	$ 339,573	$ 788,923	$ 659,987
Operating segments | RMS
Segment Reporting Information [Line Items]
Revenue	125,058	119,287	248,397	238,676
Operating segments | DSA
Segment Reporting Information [Line Items]
Revenue	221,059	153,375	379,042	293,387
Operating segments | Manufacturing
Segment Reporting Information [Line Items]
Revenue	$ 87,938	$ 66,911	$ 161,484	$ 127,924

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=26872669&loc=d3e20235-122688

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