QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Jul. 29, 2017	Jul. 30, 2016	Aug. 01, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 2,341,033	$ 2,369,556	$ 2,285,518	$ 2,278,364	$ 2,213,821	$ 2,132,104	$ 2,047,712	$ 2,076,649	$ 9,274,471	$ 8,470,286	$ 8,184,978
Gross profit	368,599	366,361	344,945	349,016	345,463	322,433	297,518	313,937	1,428,921	1,279,351	1,260,515
Income before income taxes	63,537	60,325	42,028	48,533	57,669	62,676	37,742	50,135	214,423	208,222	229,769
Net Income	$ 38,869	$ 36,587	$ 25,482	$ 29,217	$ 34,681	$ 38,271	$ 22,683	$ 30,131	$ 130,155	$ 125,766	$ 138,734
Per common share income
Basic: (in dollars per share)	$ 0.77	$ 0.72	$ 0.50	$ 0.58	$ 0.69	$ 0.76	$ 0.45	$ 0.60
Net income (in dollars per share)									$ 2.57	$ 2.50	$ 2.77
Diluted: (in dollars per share)	$ 0.76	$ 0.72	$ 0.50	$ 0.58	$ 0.69	$ 0.76	$ 0.45	$ 0.60
Net income (in dollars per share)									$ 2.56	$ 2.50	$ 2.76
Weighted average basic shares of common stock	50,617	50,601	50,587	50,475	50,381	50,350	50,326	50,194	50,570	50,313	50,021
Weighted average diluted shares of common stock	50,947	50,801	50,755	50,599	50,516	50,379	50,388	50,313	50,775	50,399	50,267
High
Per common share income
Market Price (in dollars per share)	$ 42.38	$ 45.99	$ 49.39	$ 50.06	$ 52.18	$ 43.02	$ 52.07	$ 55.69	$ 50.06	$ 55.69
Low
Per common share income
Market Price (in dollars per share)	$ 34.60	$ 39.47	$ 40.81	$ 38.55	$ 33.16	$ 29.75	$ 33.85	$ 44.05		$ 29.75