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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. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 353,850	$ 349,465	$ 339,573	$ 320,414	$ 329,548	$ 327,567	$ 341,179	$ 299,368	$ 1,363,302	$ 1,297,662	$ 1,165,528
RMS
Segment Reporting Information [Line Items]
Total revenue									473,230	507,327	511,350
DSA
Segment Reporting Information [Line Items]
Total revenue									612,173	538,218	432,378
Manufacturing
Segment Reporting Information [Line Items]
Total revenue									$ 277,899	$ 252,117	$ 221,800

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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+ References

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