Net Income Per Share and Weighted Average Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Nov. 02, 2012	Oct. 28, 2011
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 23,192	$ 23,802
Net income per share denominator: [Abstract]
Basic weighted average shares outstanding (in shares)	23,577,574	22,870,934
Add potential dilution: [Abstract]
Stock options and nonvested stock awards and MSU Grants (in shares)	210,051	274,849
Diluted weighted average shares outstanding (in shares)	23,787,625	23,145,783