CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balances at Jul. 31, 2010	$ 394,555	$ 12,885	$ 170,209	$ 169	$ 211,292
Balances (in shares) at Jul. 31, 2010		38,656,190
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)		153,841
Stock options exercised	1,321	51	1,270
Non-cash stock-based compensation expense	4,314		4,314
Issuance of restricted stock, net of tax withholdings (in shares)		67,109
Issuance of restricted stock, net of tax withholdings	(28)	23	(51)
Repurchase of common stock (in shares)	(5,389,500)	(5,389,500)
Repurchase of common stock	(64,548)	(1,797)	(62,751)
Other comprehensive income	130			130
Net income	16,107				16,107
Balances at Jul. 30, 2011	351,851	11,162	112,991	299	227,399
Balances (in shares) at Jul. 30, 2011		33,487,640
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)		617,103
Stock options exercised	6,490	206	6,284
Non-cash stock-based compensation expense (in shares)		5,168
Non-cash stock-based compensation expense	6,782	2	6,780
Issuance of restricted stock, net of tax withholdings (in shares)		75,533
Issuance of restricted stock, net of tax withholdings	(329)	25	(354)
Repurchase of common stock (in shares)	(597,700)	(597,700)
Repurchase of common stock	(12,960)	(199)	(12,761)
Other comprehensive income	(161)			(161)
Tax benefits from stock-based compensation	1,880		1,880
Net income	39,378				39,378
Balances at Jul. 28, 2012	392,931	11,196	114,820	138	266,777
Balances (in shares) at Jul. 28, 2012	33,487,640	33,587,744
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)		544,162
Stock options exercised	5,253	181	5,072
Non-cash stock-based compensation expense (in shares)		5,674
Non-cash stock-based compensation expense	9,902	2	9,900
Issuance of restricted stock, net of tax withholdings (in shares)		173,537
Issuance of restricted stock, net of tax withholdings	(884)	58	(942)
Repurchase of common stock (in shares)	(1,047,000)	(1,047,000)
Repurchase of common stock	(15,203)	(349)	(14,854)
Other comprehensive income	(35)			(35)
Tax benefits from stock-based compensation	1,209		1,209
Net income	35,188				35,188
Balances at Jul. 27, 2013	$ 428,361	$ 11,088	$ 115,205	$ 103	$ 301,965
Balances (in shares) at Jul. 27, 2013	33,587,744	33,264,117