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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, 2018 | Apr. 30, 2017
Business Combinations [Abstract] |  |
Total revenue | $ 8,438,371 | $ 7,594,401
Net income | $ 320,711 | $ 180,070
Net income per common share |  |
Basic (in Dollars per share) | $ 8.49 | $ 4.60
Diluted (in Dollars per share) | $ 8.41 | $ 4.55

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