Net Income Per Share and Weighted Average Shares (Details) (USD $) In Thousands, except Share data	3 Months Ended								12 Months Ended
	Jul. 29, 2011	Apr. 29, 2011	Jan. 28, 2011	Oct. 29, 2010	Jul. 30, 2010	Apr. 30, 2010	Jan. 29, 2010	Oct. 30, 2009	Jul. 29, 2011	Jul. 30, 2010	Jul. 31, 2009
Net Income Per Share and Weighted Average Shares [Abstract]
Income from continuing operations per share numerator	$ 17,543	$ 15,154	$ 28,777	$ 23,734	$ 27,413	$ 14,428	$ 25,393	$ 18,024	$ 85,208	$ 85,258	$ 65,957
(Loss) income from discontinued operations, net of tax, per share numerator									0	0	(31)
Net income per share numerator	$ 17,543	$ 15,154	$ 28,777	$ 23,734	$ 27,413	$ 14,428	$ 25,393	$ 18,024	$ 85,208	$ 85,258	$ 65,926
Income from continuing operations, (loss) income from discontinued operations, net of tax, and net income per share denominator: [Abstract]
Basic weighted average shares outstanding (in shares)									22,998,200	23,007,856	22,458,971
Add potential dilution: [Abstract]
Stock options and nonvested stock and stock awards (in shares)									636,475	571,896	328,662
Diluted weighted average shares outstanding (in shares)									23,634,675	23,579,752	22,787,633