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Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020
Rafael Holdings Inc [Member]
Leases (Textual)
Lease costs	$ 500	$ 500	$ 1,400	$ 1,300
Accounting Standards Update 2016-02 [Member]
Leases (Textual)
ASU 2016-02 Adoption			$ 12,400
Israel [Member]
Leases (Textual)
Lease expires					Jul. 31, 2025
Newark Lease [Member]
Leases (Textual)
Lease expires			Apr. 30, 2025

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statement.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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