Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Income Statement [Abstract]
Net sales	$ 7,246,952	$ 4,582,112	$ 4,006,819
Cost of products sold	6,203,369	3,855,787	3,449,274
Gross profit	1,043,583	726,325	557,545
Selling, general and administrative expenses	419,847	306,269	250,891
Impairment charges		9,113
Amortization of intangible assets	63,925	27,962	16,015
Interest income	923	743	1,292
Interest expense	9,730	1,592	180
Other income, net	5,382	1,181	1,144
Income from continuing operations before income taxes	556,386	383,313	292,895
Income taxes	182,132	125,291	90,886
Net income from continuing operations	374,254	258,022	202,009
Loss from discontinued operations, net of income taxes	0	(1,503)	(2,624)
Net income and comprehensive income	$ 374,254	$ 256,519	$ 199,385
Earnings per common share from continuing operations:
Basic	$ 7.12	$ 4.92	$ 3.80
Diluted	7.09	4.91	3.79
Loss per common share from discontinued operations
Basic		(0.03)	(0.05)
Diluted		(0.03)	(0.05)
Earnings per common share:
Basic	7.12	4.89	3.75
Diluted	$ 7.09	$ 4.88	$ 3.74