CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Income Statement [Abstract]
Net sales	$ 2,457,545	$ 2,278,364
Cost of sales	2,090,329	1,929,348
Gross profit	367,216	349,016
Operating expenses	312,109	295,677
Operating income	55,107	53,339
Other expense (income):
Interest expense	3,667	4,522
Interest income	(91)	(99)
Other expense (income), net	(863)	383
Total other expense, net	2,713	4,806
Income before income taxes	52,394	48,533
Provision for income taxes	21,889	19,316
Net income	$ 30,505	$ 29,217
Basic per share data:
Net income (usd per share)	$ 0.60	$ 0.58
Weighted average basic shares of common stock outstanding	50,817	50,475
Diluted per share data:
Net income (usd per share)	$ 0.60	$ 0.58
Weighted average diluted shares of common stock outstanding	50,957	50,599