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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 9 Months Ended 12 Months Ended
May 01, 2020
May 03, 2019
May 01, 2020
May 03, 2019
Aug. 02, 2019
Interest Rate Cash Flow Hedges [Abstract]          
Amount of loss recognized in AOCL on derivatives     $ (16,591)   $ (15,466)
Interest Expense [Member]          
Interest Rate Cash Flow Hedges [Abstract]          
Amount of loss reclassified from AOCL into income $ 465 $ (99) $ 559 $ 43