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Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Business Combinations [Abstract] |  |
Net sales | $ 9,067,750 | $ 11,175,302
Net income | $ 143,517 | $ 305,101
Basic earnings per common share | $ 2.66 | $ 5.55
Diluted earnings per common share | $ 2.66 | $ 5.54

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