Derivative Instruments and Hedging Activities, Offsetting of Derivative Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Aug. 02, 2019
Offsetting of derivative assets [Abstract]
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months	$ 1,721
Interest Rate Swaps [Member]
Offsetting of derivative assets [Abstract]
Reduction in fair value of interest rate swap liabilities due to adjustment related to non-performance risk	$ 358	$ 399

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

Name:	us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant