Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 02, 2013	Aug. 03, 2012	Jul. 29, 2011
Current Income Tax Expense Benefit [Abstract]
Federal	$ 44,853	$ 34,074	$ 17,231
State	4,375	7,928	5,577
Deferred Income Tax Expense Benefit [Abstract]
Federal	(4,365)	886	9,019
State	3,654	319	(1,344)
Total provision for income taxes	48,517	43,207	30,483
U.S. federal statutory rate used	35.00%
Provision computed at federal statutory income tax rate	58,024	51,201	40,492
State and local income taxes, net of federal benefit	5,698	6,424	3,050
Employer tax credits for FICA taxes paid on employee tip income	(9,635)	(9,114)	(8,351)
Other employer tax credits	(5,927)	(4,938)	(5,098)
Other-net	357	(366)	390
Total provision for income taxes	48,517	43,207	30,483
Deferred tax assets: [Abstract]
Compensation and employee benefits	16,750	14,803
Deferred rent	13,535	12,162
Accrued liabilities	12,766	12,988
Insurance reserves	12,091	12,308
Inventory	5,669	5,293
Other	4,437	13,609
Deferred tax assets	65,248	71,163
Deferred tax liabilities: [Abstract]
Property and equipment	94,179	96,783
Inventory	13,700	12,956
Other	9,550	9,402
Deferred tax liabilities	117,429	119,141
Net deferred tax liability	52,181	47,978
Reconciliation of gross liability for uncertain tax positions [Roll Forward]
Balance at beginning of year	18,098	14,167	12,965
Tax positions related to the current year: [Abstract]
Additions	3,731	3,326	2,616
Reductions	0	0	0
Tax positions related to prior years: [Abstract]
Additions	191	2,556	987
Reductions	(280)	(1,043)	(24)
Settlements	0	0	0
Expiration of statute of limitations	(768)	(908)	(2,377)
Balance at end of year	20,972	18,098	14,167
Amount of uncertain tax positions that, if recognized, would affect the effective tax rate	13,631	11,764	9,209
Potential interest and penalties [Abstract]
Interest and penalties	7,869	6,605	5,380
Interest and penalties [Abstract]
Interest and penalties related to uncertain tax positions	1,264	1,225	878
Potential decrease of liabilities for uncertain tax positions within the next twelve months , minimum	1,000
Potential decrease of liabilities for uncertain tax positions within the next twelve months , maximum	$ 2,000