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Business Segments - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Jul. 31, 2016 USD ($) Segment | Jul. 31, 2015 USD ($) | Jul. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 2 |  |
Net sales | $ 4,582,112 | $ 4,006,819 | $ 3,525,456
Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 4,582,112 | 4,006,819 | 3,525,456
Continuing Operations | Export |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 368,426 | $ 465,642 | $ 521,818
Postle Operating, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Subsidiary acquisition date | May 01, 2015 |  |

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