CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Unallocated Shares of ESOP	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Comprehensive Income
Balances at Aug. 01, 2009	$ 544,472	$ 432	$ (6,092)	$ 175,182	$ (877)	$ (1,623)	$ 377,450
Balances (in shares) at Aug. 01, 2009		43,237,000	229,000
Increase (Decrease) in Stockholders' Equity
Allocation of shares to ESOP	164				164
Stock option exercises and restricted stock vestings, net	7,143	3	5,384	3,666			(1,910)
Stock option exercises and restricted stock vestings, net (in shares)		321,000	(202,000)
Share-based compensation	8,057			8,057
Tax benefit associated with stock plans	1,822			1,822
Fair value of swap agreements, net of tax	128					128		128
Foreign currency translation	340					340		340
Net income	68,321						68,321	68,321
Total comprehensive income	68,789							68,789
Balances at Jul. 31, 2010	630,447	435	(708)	188,727	(713)	(1,155)	443,861
Balances (in shares) at Jul. 31, 2010		43,558,000	27,000
Increase (Decrease) in Stockholders' Equity
Allocation of shares to ESOP	171				171
Stock option exercises and restricted stock vestings, net	138,301	44		138,257
Stock option exercises and restricted stock vestings, net (in shares)		4,428,000
Stock option exercises and restricted stock vestings, net	7,354	6		7,348
Stock option exercises and restricted stock vestings, net (in shares)		534,000
Share-based compensation	9,159			9,159
Tax benefit associated with stock plans	1,545			1,545
Fair value of swap agreements, net of tax	732					732		732
Foreign currency translation	5,285					5,285		5,285
Net income	76,673						76,673	76,673
Total comprehensive income	82,690							82,690
Balances at Jul. 30, 2011	869,667	485	(708)	345,036	(542)	4,862	520,534
Balances (in shares) at Jul. 30, 2011	48,493,000	48,520,000	27,000
Increase (Decrease) in Stockholders' Equity
Allocation of shares to ESOP	453				453
Stock option exercises and restricted stock vestings, net	6,044	5	708	5,386			(55)
Stock option exercises and restricted stock vestings, net (in shares)		491,000	(27,000)
Share-based compensation	11,372			11,372
Tax benefit associated with stock plans	2,804			2,804
Fair value of swap agreements, net of tax	763					763		763
Foreign currency translation	(3,729)					(3,729)		(3,729)
Net income	91,342						91,342	91,342
Total comprehensive income	88,376							88,376
Balances at Jul. 28, 2012	$ 978,716	$ 490		$ 364,598	$ (89)	$ 1,896	$ 611,821
Balances (in shares) at Jul. 28, 2012	49,011,000	49,011,000