Leases, Sale and Leaseback Transactions (Details) $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 11, 2020 Pool Site	Aug. 04, 2020 USD ($) Store	Jul. 29, 2020 USD ($) Store	Jan. 29, 2021 USD ($)	Jan. 31, 2020 USD ($)	Jan. 29, 2021 USD ($)	Jan. 31, 2020 USD ($)	Jul. 31, 2009 Store	Jul. 31, 2020 USD ($)	[1]
Sale Leaseback Transactions [Abstract]
Initial lease term		20 years
Aggregate purchase price, net of closing costs		$ 146,357
Aggregate initial annual rent payment for lease properties		$ 10,393
Percentage of increase in annual rental payments in initial terms		1.00%
Gain on sale and leaseback transaction		$ 217,722		$ 0	$ 0	$ 217,722	$ 0
Operating lease right-of-use assets		309,624		997,764		997,764			$ 691,949
Right-of-use assets, non-cash		175,960
Operating lease liabilities		$ 133,663		$ 813,114		$ 813,114
Number of separate lease pools | Pool	2
Number of sites removed from original lease and placed in new master lease | Site	35
Maximum [Member]
Sale Leaseback Transactions [Abstract]
Lease renewal option		50 years
Owned Stores [Member]
Sale Leaseback Transactions [Abstract]
Number of owned stores involved in sale-lease back transactions | Store		62
Aggregate purchase price, net of closing costs			$ 198,083
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]
Sale Leaseback Transactions [Abstract]
Initial lease term				20 years		20 years
Remaining property purchased				$ 3,200		$ 3,200
Aggregate initial annual rent payment for lease properties						$ 14,379
Percentage of increase in annual rental payments in initial terms						1.00%
Gain on sale and leaseback transaction						$ 69,954
Operating lease right-of-use assets				261,698		261,698
Right-of-use assets, non-cash				79,049		79,049
Operating lease liabilities				$ 182,649		$ 182,649
Sale-leaseback Transactions in 2000 [Member] | Maximum [Member]
Sale Leaseback Transactions [Abstract]
Lease renewal option				50 years		50 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
Number of stores completed in sale leaseback transaction | Store			64

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of July 31, 2020, as filed with the Securities and Exchange Commission in the Company’s Annual Report on Form 10-K for the fiscal year ended July 31, 2020.