Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 02, 2019	Aug. 03, 2018	Jul. 28, 2017
Current [Abstract]
Federal	$ 38,831	$ 40,761	$ 83,743
State	8,310	6,099	7,567
Deferred [Abstract]
Federal	(1,427)	(16,779)	4,696
State	(2,759)	722	982
Total provision for income taxes	$ 42,955	$ 30,803	$ 96,988
Reconciliation of provision for income taxes and income taxes [Abstract]
U.S. federal statutory rate used	21.00%	26.90%	35.00%
Provision computed at federal statutory income tax rate	$ 55,935	$ 74,859	$ 104,611
State and local income taxes, net of federal benefit	4,248	5,066	5,856
Revaluation of deferred taxes due to a reduction in the federal tax rate at the enactment date of the Tax Act	0	(26,772)	0
Revaluation of deferred taxes due to the impact of the change in rate on 2018 temporary items	0	(3,710)	0
Employer tax credits for FICA taxes paid on employee tip income	(15,107)	(13,707)	(11,543)
Other employer tax credits	(3,537)	(4,476)	(2,814)
Other-net	1,416	(457)	878
Total provision for income taxes	42,955	30,803	96,988
Deferred tax assets [Abstract]
Compensation and employee benefits	6,496	6,342
Deferred rent	13,424	12,667
Accrued liabilities	21,379	8,546
Insurance reserves	7,571	7,291
Inventory	2,873	3,106
Other	536	0
Deferred tax assets	52,279	37,952
Deferred tax liabilities [Abstract]
Property and equipment	85,379	75,433
Inventory	7,363	7,448
Other	3,656	7,232
Deferred tax liabilities	96,398	90,113
Net deferred tax liability	44,119	52,161
Reconciliation of gross liability for uncertain tax positions [Roll Forward]
Balance at beginning of year	18,634	20,731	21,899
Tax positions related to the current year [Abstract]
Additions	2,742	3,029	4,003
Reductions	0	0	0
Tax positions related to prior year [Abstract]
Additions	203	610	582
Reductions	(348)	(575)	(2,966)
Settlements	(1,784)	(3,878)	(1,027)
Expiration of statute of limitations	(1,441)	(1,283)	(1,760)
Balance at end of year	18,006	18,634	20,731
Uncertain tax positions	14,225	14,721	13,475
Potential interest and penalties [Abstract]
Interest and penalties	6,297	5,681	6,128
Interest and penalties [Abstract]
Interest and penalties related to uncertain tax positions	616	$ (447)	$ 631
Minimum [Member]
Uncertain Tax Positions [Abstract]
Potential decrease of liabilities for uncertain tax positions within the next twelve months	3,000
Maximum [Member]
Uncertain Tax Positions [Abstract]
Potential decrease of liabilities for uncertain tax positions within the next twelve months	$ 4,000