Derivative Instruments and Hedging Activities, Estimated Fair Values of Derivative Instruments (Details) - Interest Rate Swaps [Member] - USD ($) $ in Thousands		Jul. 31, 2020	Aug. 02, 2019
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, liability	[1]	$ 27,746	$ 10,483
Other Current Liabilities [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, liability	[1]	3,886	0
Long-term Interest Rate Swap Liability [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, liability	[1]	$ 23,860	$ 10,483

[1] **These interest rate swap liabilities are recorded gross at both July 31, 2020 and August 2, 2019 since there were no offsetting assets under the Company’s master netting agreements.