QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Aug. 02, 2014	Aug. 03, 2013		Jul. 28, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,764,666	$ 1,781,729	$ 1,646,041	$ 1,602,011	$ 1,642,398	$ 1,566,217	$ 1,445,703	$ 1,410,037	$ 6,794,447	$ 6,064,355		$ 5,236,021
Gross profit	290,173	298,129	268,167	271,176	284,453	262,997	241,673	235,953	1,127,645	1,025,076		916,003
Income before income taxes	53,896	60,653	46,586	46,273	53,284	52,278	37,574	30,980	207,408	174,116		150,783
Net Income	$ 33,375	$ 36,392	$ 27,951	$ 27,764	$ 32,077	$ 31,621	$ 22,620	$ 21,536	$ 125,482	$ 107,854		$ 91,342
Per common share income
Basic: (in dollars per share)	$ 0.67	$ 0.73	$ 0.56	$ 0.56	$ 0.65	$ 0.64	$ 0.46	$ 0.44
Net income (in dollars per share)									$ 2.53	$ 2.19	[1]	$ 1.87
Diluted: (in dollars per share)	$ 0.67	$ 0.73	$ 0.56	$ 0.56	$ 0.65	$ 0.64	$ 0.46	$ 0.43
Net income (in dollars per share)									$ 2.52	$ 2.18		$ 1.86
Weighted average basic shares of common stock	49,675	49,635	49,615	49,439	49,320	49,303	49,289	49,192	49,602	49,217		48,766
Weighted average diluted shares of common stock	49,972	49,931	49,873	49,735	49,646	49,567	49,582	49,585	49,888	49,509		49,100
High
Per common share income
Market Price (in dollars per share)	$ 69.85	$ 79.64	$ 76.85	$ 75.85	$ 60.42	$ 56.45	$ 56.01	$ 61.26	$ 79.64	$ 61.26
Low
Per common share income
Market Price (in dollars per share)	$ 58.04	$ 64.12	$ 66.74	$ 58.29	$ 47.67	$ 47.20	$ 50.25	$ 52.72	$ 58.04	$ 47.20

[1] Total reflects rounding