CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Balance at Jul. 31, 2009	$ 135,622	$ 227	$ 12,972	$ (44,822)	$ 167,245
Balance (in shares) at Jul. 31, 2009		22,722,685
Comprehensive Income:
Net income	85,258	0	0	0	85,258
Change in fair value of interest rate swap, net of tax	(4,027)	0	0	(4,027)	0
Total comprehensive income	81,231	0	0	(4,027)	85,258
Cash dividends declared	(18,465)	0	0	0	(18,465)
Share-based compensation	13,193	0	13,193	0	0
Exercise of share-based compensation awards (in shares)		1,362,096
Exercise of share-based compensation awards	37,460	14	37,446	0	0
Tax benefit realized upon exercise of share-based compensation awards	5,063	0	5,063	0	0
Purchases and retirement of common stock (in shares)	(1,352,000)	(1,352,000)
Purchases and retirement of common stock	(62,487)	(13)	(62,474)	0	0
Balance at Jul. 30, 2010	191,617	228	6,200	(48,849)	234,038
Balance (in shares) at Jul. 30, 2010		22,732,781
Comprehensive Income:
Net income	85,208	0	0	0	85,208
Change in fair value of interest rate swap, net of tax	10,817	0	0	10,817	0
Total comprehensive income	96,025	0	0	10,817	85,208
Cash dividends declared	(20,489)	0	0	0	(20,489)
Share-based compensation	9,796	0	9,796	0	0
Exercise of share-based compensation awards (in shares)		784,793
Exercise of share-based compensation awards	20,540	7	20,533	0	0
Tax benefit realized upon exercise of share-based compensation awards	4,108	0	4,108	0	0
Purchases and retirement of common stock (in shares)	(676,600)	(676,600)
Purchases and retirement of common stock	(33,563)	(7)	(33,556)	0	0
Balance at Jul. 29, 2011	268,034	228	7,081	(38,032)	298,757
Balance (in shares) at Jul. 29, 2011	22,840,974	22,840,974
Comprehensive Income:
Net income	103,081	0	0	0	103,081
Change in fair value of interest rate swap, net of tax	16,874	0	0	16,874	0
Total comprehensive income	119,955	0	0	16,874	103,081
Cash dividends declared	(26,915)	0	0	0	(26,915)
Share-based compensation	14,420	0	14,420	0	0
Exercise of share-based compensation awards (in shares)		897,588
Exercise of share-based compensation awards	17,602	9	17,593	0	0
Tax benefit realized upon exercise of share-based compensation awards	4,502	0	4,502	0	0
Purchases and retirement of common stock (in shares)	(265,538)	(265,538)
Purchases and retirement of common stock	(14,923)	(3)	(14,920)	0	0
Balance at Aug. 03, 2012	$ 382,675	$ 234	$ 28,676	$ (21,158)	$ 374,923
Balance (in shares) at Aug. 03, 2012	23,473,024	23,473,024