Schedule of Segment Reporting Information, by Segment Geographic Region Item (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 7,864,758	$ 8,328,909	$ 7,246,952
Property, plant and equipment, net	1,092,471	522,054	425,238
United States
Segment Reporting Information [Line Items]
Net sales	5,803,373	7,540,015	6,618,874
Property, plant and equipment, net	569,641	522,054	425,238
Germany
Segment Reporting Information [Line Items]
Net sales	836,151	1,687	1,138
Property, plant and equipment, net	424,333	0	0
Other Europe
Segment Reporting Information [Line Items]
Net sales	636,105	4,358	1,504
Property, plant and equipment, net	92,553	0	0
Canada
Segment Reporting Information [Line Items]
Net sales	561,172	776,068	614,528
Other foreign
Segment Reporting Information [Line Items]
Net sales	27,957	6,781	10,908
Other
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 5,944	$ 0	$ 0