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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Segment Reporting Information [Line Items]
Revenue	$ 445,763	$ 354,868
Operating segments | RMS
Segment Reporting Information [Line Items]
Revenue	127,161	123,339
Operating segments | DSA
Segment Reporting Information [Line Items]
Revenue	227,758	157,983
Operating segments | Manufacturing
Segment Reporting Information [Line Items]
Revenue	$ 90,844	$ 73,546

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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