CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017
Income Statement [Abstract]
Net sales	$ 2,528,011	$ 2,285,518	$ 4,985,556	$ 4,563,882
Cost of sales	2,156,489	1,940,573	4,246,818	3,869,921
Gross profit	371,522	344,945	738,738	693,961
Operating expenses	320,076	298,674	632,185	594,351
Restructuring and asset impairment expenses	11,242	0	11,242	0
Total operating expenses	331,318	298,674	643,427	594,351
Operating income	40,204	46,271	95,311	99,610
Other expense (income):
Interest expense	4,233	4,441	7,900	8,963
Interest income	(96)	(97)	(187)	(196)
Other expense (income), net	(418)	(101)	(1,281)	282
Total other expense, net	3,719	4,243	6,432	9,049
Income before income taxes	36,485	42,028	88,879	90,561
Provision for income taxes (benefit)	(14,001)	16,546	7,888	35,862
Net income	$ 50,486	$ 25,482	$ 80,991	$ 54,699
Basic per share data:
Net income (usd per share)	$ 1.00	$ 0.50	$ 1.60	$ 1.08
Weighted average basic shares of common stock outstanding	50,449	50,587	50,633	50,531
Diluted per share data:
Net income (usd per share)	$ 0.99	$ 0.50	$ 1.59	$ 1.08
Weighted average diluted shares of common stock outstanding	50,741	50,755	50,849	50,677