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Derivative Instruments and Hedging Activities, Offsetting of Derivative Assets (Details) - USD ($)
$ in Thousands
May 03, 2019
Aug. 03, 2018
Offsetting of derivative assets [Abstract]    
Estimated pre-tax portion of AOCIL that is expected to be reclassified into earnings over the next twelve months $ 530  
Interest Rate Swaps [Member]    
Offsetting of derivative assets [Abstract]    
Gross asset amounts 295 $ 6,255
Liability amount offset (257) 0
Net asset amount presented in the balance sheets 38 6,255
Reduction in fair value of interest rate swap assets and liabilities due to adjustment related to non-performance risk $ 62 $ 213