Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Income Statement [Abstract]
Net sales	$ 2,015,224	$ 1,284,054	$ 5,312,280	$ 3,289,476
Cost of products sold	1,721,383	1,082,117	4,569,985	2,786,501
Gross profit	293,841	201,937	742,295	502,975
Selling, general and administrative expenses	111,122	80,833	310,401	216,653
Amortization of intangible assets	15,216	5,780	48,710	17,662
Impairment charges				9,113
Interest income	205	230	535	473
Interest expense	2,547	166	7,593	508
Other income, net	1,070	895	4,270	350
Income from continuing operations before income taxes	166,231	116,283	380,396	259,862
Income taxes	54,968	37,090	125,606	84,686
Net income from continuing operations	111,263	79,193	254,790	175,176
Loss from discontinued operations, net of income taxes		(611)		(1,429)
Net income and comprehensive income	$ 111,263	$ 78,582	$ 254,790	$ 173,747
Weighted-average common shares outstanding:
Basic	52,582,134	52,474,801	52,555,792	52,453,025
Diluted	52,773,106	52,601,673	52,739,716	52,569,294
Earnings per common share from continuing operations:
Basic	$ 2.12	$ 1.51	$ 4.85	$ 3.34
Diluted	2.11	1.51	4.83	3.33
Earnings per common share:
Basic	2.12	1.50	4.85	3.31
Diluted	2.11	1.49	4.83	3.31
Regular dividends declared and paid per common share	$ 0.33	$ 0.30	$ 0.99	$ 0.90