Leases, Supplemental Cash Flow Information and Non-cash Activity Related to Operating Leases (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 04, 2020	Apr. 30, 2021	May 01, 2020	Apr. 30, 2021	May 01, 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		22,279	20,192	66,960	60,024
Noncash information [Abstract]
Right-of-use assets obtained in exchange for new operating lease liabilities		267	623	315,456	5,062
Lease modifications or reassessments increasing or decreasing right-of-use assets		3,471	2,455	28,515	14,972
Lease modifications removing right-of-use assets		$ (104)	$ (196)	$ (452)	$ (1,125)