Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

Name:	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Leases (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
Leases (Details) - USD ($) $ in Millions	Sep. 01, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Leases (Details) [Line Items]
Operating lease liability	$ 0.6
Newark NJ [Member]
Leases (Details) [Line Items]
Lease term, description				The Newark lease expires in April 2025 and the Israel lease expires in July 2025.
Rafael Holdings, Inc. [Member]
Leases (Details) [Line Items]
Lease cost		$ 0.5	$ 0.5	$ 0.9	$ 0.9