Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,588,525	$ 975,071	$ 3,297,056	$ 2,005,422
Cost of products sold	1,376,823	826,249	2,848,602	1,704,384
Gross profit	211,702	148,822	448,454	301,038
Selling, general and administrative expenses	96,969	67,366	199,279	135,820
Amortization of intangible assets	15,279	5,854	33,494	11,882
Impairment charges		9,113		9,113
Interest income	177	105	330	243
Interest expense	2,486	168	5,046	342
Other income (expense), net	1,220	(538)	3,200	(545)
Income from continuing operations before income taxes	98,365	65,888	214,165	143,579
Income taxes	33,583	20,641	70,638	47,596
Net income from continuing operations	64,782	45,247	143,527	95,983
Loss from discontinued operations, net of income taxes		(579)		(818)
Net income and comprehensive income	$ 64,782	$ 44,668	$ 143,527	$ 95,165
Weighted-average common shares outstanding:
Basic	52,582,134	52,474,801	52,543,050	52,442,373
Diluted	52,740,959	52,561,122	52,723,450	52,553,341
Earnings per common share from continuing operations:
Basic	$ 1.23	$ 0.86	$ 2.73	$ 1.83
Diluted	1.23	0.86	2.72	1.83
Earnings per common share:
Basic	1.23	0.85	2.73	1.81
Diluted	1.23	0.85	2.72	1.81
Regular dividend declared and paid per common share	$ 0.33	$ 0.30	$ 0.66	$ 0.60