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Leases (Details) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
Leases (Details) $ in Thousands	Jul. 31, 2000 Store	May 01, 2020 USD ($)	May 01, 2020 USD ($) Period	Jul. 31, 2009 Store	Jul. 28, 2000 Store	Aug. 02, 2019 USD ($)
Components of Lease Cost for Operating Leases [Abstract]
Operating lease cost		$ 20,977	$ 61,295
Short term lease cost		361	2,637
Variable lease cost		309	1,239
Total lease cost		21,647	65,171
Operating cash flow information [Abstract]
Cash paid for amounts included in the measurement of lease liabilities		20,192	60,024
Noncash information [Abstract]
Right-of-use assets obtained in exchange for new operating lease liabilities		623	5,062
Lease modifications granting additional right-of-use assets		2,455	14,972
Lease modifications removing right-of-use assets		$ (196)	$ (1,125)
Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate for Operating Leases [Abstract]
Weighted-average remaining lease term		18 years 1 month 20 days	18 years 1 month 20 days
Weighted-average discount rate		3.87%	3.87%
Maturities of Undiscounted Cash Flows Reconciled to Total Lease Liability [Abstract]
Remainder of 2020		$ 20,182	$ 20,182
2021		53,806	53,806
2022		42,414	42,414
2023		38,189	38,189
2024		36,760	36,760
Thereafter		535,281	535,281
Total future minimum lease payments		726,632	726,632
Less imputed remaining interest		(225,986)	(225,986)
Total present value of operating lease liabilities		$ 500,646	$ 500,646
Maturities of Lease Commitments Prior to Adoption of New Lease Guidance [Abstract]
2020						$ 69,249
2021						40,962
2022						36,280
2023						33,639
2024						34,020
Thereafter						515,169
Total						$ 729,319
Restaurant [Member]
Sale Leaseback Transactions [Abstract]
Initial lease term		10 years	10 years
Lease renewal option		5 years	5 years
Undiscounted future payments for leases not yet commenced		$ 15,898	$ 15,898
Restaurant [Member] \| Minimum [Member]
Sale Leaseback Transactions [Abstract]
Number of optional renewal periods \| Period			4
Restaurant [Member] \| Maximum [Member]
Sale Leaseback Transactions [Abstract]
Number of optional renewal periods \| Period			5
Sale-leaseback Transactions in 2009 [Member] \| Owned Stores [Member]
Sale Leaseback Transactions [Abstract]
Number of owned stores involved in sale-lease back transactions \| Store				15
Initial lease term		20 years	20 years
Lease renewal option		20 years	20 years
Sale-leaseback Transactions in 2009 [Member] \| Retail Distribution Center [Member]
Sale Leaseback Transactions [Abstract]
Initial lease term		15 years	15 years
Lease renewal option		20 years	20 years
Sale-leaseback Transactions in 2000 [Member] \| Owned Stores [Member]
Sale Leaseback Transactions [Abstract]
Number of owned stores involved in sale-lease back transactions \| Store	65				65
Initial lease term		21 years	21 years
Lease renewal option		20 years	20 years