Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Income Statement [Abstract]
Net sales	$ 2,231,668	$ 1,708,531
Cost of products sold	1,898,483	1,471,779
Gross profit	333,185	236,752
Selling, general and administrative expenses	134,263	102,310
Amortization of intangible assets	13,558	18,215
Interest income	381	153
Interest expense	1,412	2,560
Other income, net	2,758	1,980
Income before income taxes	187,091	115,800
Income taxes	58,685	37,055
Net income and comprehensive income	$ 128,406	$ 78,745
Weighted-average common shares outstanding:
Basic	52,611,926	52,503,966
Diluted	52,818,363	52,705,942
Earnings per common share:
Basic	$ 2.44	$ 1.50
Diluted	2.43	1.49
Regular dividends declared per common share	$ 0.37	$ 0.33