Derivative Instruments and Hedging Activities, Estimated Fair Values of Derivative Instruments (Details) - Interest Rate Swaps [Member] - USD ($) $ in Thousands		Aug. 03, 2018	Jul. 28, 2017
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, asset	[1]	$ 6,255	$ 32
Fair value, liability	[1]	0	6,880
Prepaid Expenses and Other Current Assets [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, asset	[1]	169	32
Other Assets [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, asset	[1]	6,086	0
Other Current Liabilities [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, liability	[1]	0	47
Long-term Interest Rate Swap Liability [Member]
Estimated Fair Value of Derivative Instruments [Abstract]
Fair value, liability	[1]	$ 0	$ 6,833

[1] These interest rate swap assets and liabilities are recorded at gross at both August 3, 2018 and July 28, 2017 since there were no offsetting assets and liabilities under the Company's master netting agreements.