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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Revenue	$ 339,573	$ 341,179	$ 659,987	$ 640,547
Research Models and Services
Segment Reporting Information [Line Items]
Revenue	120,044	133,120	240,055	265,615
Discovery and Safety Assessment
Segment Reporting Information [Line Items]
Revenue	153,375	142,614	293,387	247,752
Endotoxin and Microbial Detection
Segment Reporting Information [Line Items]
Revenue	33,653	33,579	66,479	66,045
Other manufacturing support
Segment Reporting Information [Line Items]
Revenue	32,501	31,866	60,066	61,135
Manufacturing Support
Segment Reporting Information [Line Items]
Revenue	$ 66,154	$ 65,445	$ 126,545	$ 127,180

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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