Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Statement [Abstract]
Net sales	$ 8,328,909	$ 7,246,952	$ 4,582,112
Cost of products sold	7,164,243	6,203,369	3,855,787
Gross profit	1,164,666	1,043,583	726,325
Selling, general and administrative expenses	477,444	419,847	306,269
Impairment charges			9,113
Amortization of intangible assets	55,118	63,925	27,962
Interest income	2,148	923	743
Interest expense	5,187	9,730	1,592
Other income, net	3,964	5,382	1,181
Income from continuing operations before income taxes	633,029	556,386	383,313
Income taxes	202,878	182,132	125,291
Net income from continuing operations	430,151	374,254	258,022
Loss from discontinued operations, net of income taxes			(1,503)
Net income and comprehensive income	$ 430,151	$ 374,254	$ 256,519
Earnings per common share from continuing operations:
Basic	$ 8.17	$ 7.12	$ 4.92
Diluted	8.14	7.09	4.91
Loss per common share from discontinued operations:
Basic			(0.03)
Diluted			(0.03)
Earnings per common share:
Basic	8.17	7.12	4.89
Diluted	$ 8.14	$ 7.09	$ 4.88