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Acquisitions Proforma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Oct. 31, 2017 | Oct. 31, 2016
Business Combinations [Abstract] |  |
Total revenues | $ 4,266,959 | $ 3,916,012
Net earnings | $ 106,209 | $ 125,401
Earnings per common share: |  |
Pro forma earnings per share, basic (in dollars per share) | $ 2.79 | $ 3.20
Pro forma earnings per share, diluted (in dollars per share) | $ 2.76 | $ 3.16

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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=79982066&loc=d3e1392-128463 + Details
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