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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

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- 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 + Details
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