Net Income Per Share and Weighted Average Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Feb. 01, 2013	Jan. 31, 2014	Feb. 01, 2013
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 37,055	$ 35,168	$ 64,215	$ 58,360
Net income per share denominator: [Abstract]
Weighted average shares (in shares)	23,812,777	23,711,235	23,815,107	23,644,405
Add potential dilution: [Abstract]
Stock options, nonvested stock awards and MSU Grants	157,834	234,001	132,743	222,026
Diluted weighted average shares (in shares)	23,970,611	23,945,236	23,947,850	23,866,431