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Business Acquisitions Business Acquisitions - Early Discovery Pro Forma Information (Details) - Early Discovery UK - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 27, 2015 | Jun. 28, 2014 | Jun. 27, 2015 | Jun. 28, 2014
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 339,573 | $ 341,179 | $ 659,987 | $ 665,656
Net income attributable to common shareholders | $ 48,509 | $ 35,264 | $ 80,050 | $ 65,688
Earnings per common share |  |  |  |
Basic (in dollars per share) | $ 1.04 | $ 0.75 | $ 1.71 | $ 1.40
Diluted (in dollars per share) | $ 1.02 | $ 0.74 | $ 1.68 | $ 1.38

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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