Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 01, 2014	Aug. 02, 2013	Aug. 03, 2012
Current [Abstract]
Federal	$ 53,713	$ 44,853	$ 34,074
State	4,597	4,375	7,928
Deferred [Abstract]
Federal	(2,863)	(4,365)	886
State	3,274	3,654	319
Total provision for income taxes	58,721	48,517	43,207
U.S. federal statutory rate used (in hundredths)	35.00%
Provision computed at federal statutory income tax rate	66,797	58,024	51,201
State and local income taxes, net of federal benefit	5,029	5,698	6,424
Employer tax credits for FICA taxes paid on employee tip income	(9,962)	(9,635)	(9,114)
Other employer tax credits	(3,781)	(5,927)	(4,938)
Other-net	638	357	(366)
Total provision for income taxes	58,721	48,517	43,207
Deferred tax assets [Abstract]
Compensation and employee benefits	10,858	16,750
Deferred rent	14,900	13,535
Accrued liabilities	13,942	12,766
Insurance reserves	11,944	12,091
Inventory	6,212	5,669
Other	3,172	4,437
Deferred tax assets	61,028	65,248
Deferred tax liabilities [Abstract]
Property and equipment	88,543	94,179
Inventory	13,415	13,700
Other	9,591	9,550
Deferred tax liabilities	111,549	117,429
Net deferred tax liability	50,521	52,181
Reconciliation of gross liability for uncertain tax positions [Roll Forward]
Balance at beginning of year	20,972	18,098	14,167
Tax positions related to the current year [Abstract]
Additions	3,989	3,731	3,326
Reductions	0	0	0
Tax positions related to prior years [Abstract]
Additions	1,400	191	2,556
Reductions	(1,630)	(280)	(1,043)
Settlements	(755)	0	0
Expiration of statute of limitations	(1,144)	(768)	(908)
Balance at end of year	22,832	20,972	18,098
Amount of uncertain tax positions that, if recognized, would affect the effective tax rate	14,840	13,631	11,764
Potential interest and penalties [Abstract]
Interest and penalties	8,559	7,869	6,605
Interest and penalties [Abstract]
Interest and penalties related to uncertain tax positions	691	1,264	1,225
Potential decrease of liabilities for uncertain tax positions within the next twelve months , minimum	2,000
Potential decrease of liabilities for uncertain tax positions within the next twelve months , maximum	$ 4,000