Derivative Instruments and Hedging Activities, Pre-tax Effects of Derivative Instruments on AOCL and Income (Details) - Interest Rate Swaps [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 29, 2021	Jan. 31, 2020	Jan. 29, 2021	Jan. 31, 2020	Jul. 31, 2020
Interest Rate Cash Flow Hedges [Abstract]
Amount of income (loss) recognized in AOCL on derivatives (effective portion)			$ 4,886		$ (17,740)
Interest Expense [Member]
Interest Rate Cash Flow Hedges [Abstract]
Amount of loss reclassified from AOCL into income (effective portion)	$ 2,158	$ 176	$ 3,984	$ 94