CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Jul. 25, 2009	$ 12,999	$ 172,112	$ 69	$ 205,443	$ 390,623
Balance (in shares) at Jul. 25, 2009	38,998,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised	2	31	0	0	33
Stock options exercised (in shares)	4,841
Tax benefit (deficit) from stock option and restricted stock plans	0	(603)	0	0	(603)
Non-cash / Stock-based compensation expense	0	3,316	0	0	3,316
Non-cash / Stock-based compensation expense (in shares)	0
Issuance of restricted stock, net of tax witholdings	43	(317)	0	0	(274)
Issuance of restricted stock, net of cancellations (in shares)	128,438
Repurchase of common stock	(159)	(4,330)	0	0	(4,489)
Repurchase of common stock (in shares)	(475,602)
Other comprehensive income (loss)	0	0	100	0	100
Net income	0	0	0	5,849	5,849
Balance at Jul. 31, 2010	12,885	170,209	169	211,292	394,555
Balance (in shares) at Jul. 31, 2010	38,656,190
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised	51	1,270	0	0	1,321
Stock options exercised (in shares)	153,841
Non-cash / Stock-based compensation expense	0	4,314	0	0	4,314
Non-cash / Stock-based compensation expense (in shares)	0
Issuance of restricted stock, net of tax witholdings	23	(51)	0	0	(28)
Issuance of restricted stock, net of cancellations (in shares)	67,109
Repurchase of common stock	(1,797)	(62,751)	0	0	(64,548)
Repurchase of common stock (in shares)	(5,389,500)
Other comprehensive income (loss)	0	0	130	0	130
Net income	0	0	0	16,107	16,107
Balance at Jul. 30, 2011	11,162	112,991	299	227,399	351,851
Balance (in shares) at Jul. 30, 2011	33,487,640				33,487,640
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised	206	6,284	0	0	6,490
Stock options exercised (in shares)	617,103
Tax benefit (deficit) from stock option and restricted stock plans	0	1,880	0	0	1,880
Non-cash / Stock-based compensation expense	2	6,780	0	0	6,782
Non-cash / Stock-based compensation expense (in shares)	5,168
Issuance of restricted stock, net of tax witholdings	25	(354)	0	0	(329)
Issuance of restricted stock, net of cancellations (in shares)	75,533
Repurchase of common stock	(199)	(12,761)	0	0	(12,960)
Repurchase of common stock (in shares)	(597,700)
Other comprehensive income (loss)	0	0	(161)	0	(161)
Net income	0	0	0	39,378	39,378
Balance at Jul. 28, 2012	$ 11,196	$ 114,820	$ 138	$ 266,777	$ 392,931
Balance (in shares) at Jul. 28, 2012	33,587,744				33,587,744