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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 25, 2016 | Jul. 01, 2017 | Jun. 25, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 469,129 | $ 434,055 | $ 914,892 | $ 788,923
Operating segments | RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 124,002 | 125,058 | 251,163 | 248,397
Operating segments | DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 252,092 | 221,059 | 479,850 | 379,042
Operating segments | Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 93,035 | $ 87,938 | $ 183,879 | $ 161,484

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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=63488584&loc=d3e20235-122688 + Details
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