Business Segments - Additional Information (Detail) $ in Thousands	12 Months Ended
	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