Leases, Supplemental Cash Flow Information and Non-cash Activity Related to Operating Leases (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 04, 2020	Jan. 29, 2021	Jan. 31, 2020	Jan. 29, 2021	Jan. 31, 2020
Operating cash flow information [Abstract]
Gain on sale and leaseback transaction	$ 217,722	$ 0	$ 0	$ 217,722	$ 0
Cash paid for amounts included in the measurement of lease liabilities		22,415	20,286	44,681	39,832
Noncash information [Abstract]
Right-of-use assets obtained in exchange for new operating lease liabilities		3,556	601	315,189	4,439
Lease modifications or reassessments increasing or decreasing right-of-use assets		1,787	5,691	25,044	12,517
Lease modifications removing right-of-use assets		$ (89)	$ (280)	$ (348)	$ (929)