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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, 2015 | Apr. 30, 2014
Business Combinations [Abstract] |  |
Total revenue | $ 7,794,626 | $ 7,948,786
Net income | $ 181,100 | $ 128,265
Net income per common share |  |
Basic (in Dollars per share) | $ 4.67 | $ 3.34
Diluted (in Dollars per share) | $ 4.63 | $ 3.30

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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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