Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Aug. 02, 2019	Aug. 03, 2018	Jul. 28, 2017
Current [Abstract]
Federal	$ (15,375)	$ 38,831	$ 40,761
State	(2,115)	8,310	6,099
Deferred [Abstract]
Federal	(13,467)	(1,427)	(16,779)
State	2,274	(2,759)	722
Total provision for income taxes (income tax benefit)	$ (28,683)	$ 42,955	$ 30,803
Reconciliation of provision for income taxes (income tax benefit) and income taxes [Abstract]
U.S. federal statutory rate used	21.00%	21.00%	26.90%	35.00%
Provision computed at federal statutory income tax rate	$ 17,070	$ 55,935	$ 74,859
State and local income taxes, net of federal benefit	(263)	4,248	5,066
Loss on unconsolidated subsidiary	(29,913)	0	0
Federal net operating loss benefit	(1,573)	0	0
Revaluation of deferred taxes due to a reduction in the federal tax rate at the enactment date of the Tax Act	0	0	(26,772)
Revaluation of deferred taxes due to the impact of the change in rate on 2018 temporary items	0	0	(3,710)
Employer tax credits for FICA taxes paid on employee tip income	(11,489)	(15,107)	(13,707)
Other employer tax credits	(3,606)	(3,537)	(4,476)
Other-net	1,091	1,416	(457)
Total provision for income taxes (income tax benefit)	(28,683)	42,955	30,803
Deferred tax assets [Abstract]
Compensation and employee benefits	6,559	6,496
Deferred rent	0	13,424
Accrued liabilities	9,587	21,379
Operating lease liabilities	168,395	0
Insurance reserves	6,772	7,571
Inventory	3,104	2,873
Deferred tax credits	19,419	0
Deferred loss on equity investment	35,281	0
Other	8,076	536
Deferred tax assets	257,193	52,279
Deferred tax liabilities [Abstract]
Property and equipment	99,452	85,379
Inventory	7,144	7,363
Operating lease right-of-use asset	172,641	0
Other	5,674	3,656
Deferred tax liabilities	284,911	96,398
Net deferred tax liability	27,718	44,119
Reconciliation of gross liability for uncertain tax positions [Roll Forward]
Balance at beginning of year	18,006	18,634	20,731
Tax positions related to the current year [Abstract]
Additions	1,407	2,742	3,029
Reductions	0	0	0
Tax positions related to prior year [Abstract]
Additions	202	203	610
Reductions	(256)	(348)	(575)
Settlements	(138)	(1,784)	(3,878)
Expiration of statute of limitations	(1,386)	(1,441)	(1,283)
Balance at end of year	17,835	18,006	18,634	$ 20,731
Uncertain tax positions	14,090	14,225	14,721
Potential interest and penalties [Abstract]
Interest and penalties	7,210	6,297	5,681
Interest and penalties [Abstract]
Interest and penalties related to uncertain tax positions	913	$ 616	$ (447)
Minimum [Member]
Uncertain Tax Positions [Abstract]
Potential decrease of liabilities for uncertain tax positions within the next twelve months	2,000
Maximum [Member]
Uncertain Tax Positions [Abstract]
Potential decrease of liabilities for uncertain tax positions within the next twelve months	$ 3,000