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Acquisitions - Summary of Unaudited Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015
Business Combinations [Abstract] |  |
Total revenue | $ 7,132,349 | $ 7,785,111
Net income | $ 226,271 | $ 181,051
Net income per common share |  |
Basic (in Dollars per share) | $ 5.80 | $ 4.67
Diluted (in Dollars per share) | $ 5.74 | $ 4.63

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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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