Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Net sales	$ 2,251,570	$ 2,015,224	$ 6,454,798	$ 5,312,280
Cost of products sold	1,934,825	1,721,383	5,534,540	4,569,985
Gross profit	316,745	293,841	920,258	742,295
Selling, general and administrative expenses	119,449	111,122	370,800	310,401
Amortization of intangible assets	13,882	15,216	41,236	48,710
Interest income	460	205	1,242	535
Interest expense	1,383	2,547	4,149	7,593
Other income (expense), net	(1,966)	1,070	3,366	4,270
Income before income taxes	180,525	166,231	508,681	380,396
Income taxes	46,737	54,968	166,735	125,606
Net income and comprehensive income	$ 133,788	$ 111,263	$ 341,946	$ 254,790
Weighted-average common shares outstanding:
Basic	52,695,365	52,582,134	52,667,016	52,555,792
Diluted	52,853,541	52,773,106	52,844,040	52,739,716
Earnings per common share:
Basic	$ 2.54	$ 2.12	$ 6.49	$ 4.85
Diluted	2.53	2.11	6.47	4.83
Regular dividends declared and paid per common share	$ 0.37	$ 0.33	$ 1.11	$ 0.99