Description of Business (Details)	6 Months Ended
	Jan. 31, 2020
Rafael Holdings, Inc. [Member]
Country of Incorporation	United States – Delaware
Broad Atlantic Associates, LLC [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	100.00%
IDT 225 Old NB Road, LLC [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	100.00%
IDT R.E. Holdings Ltd. [Member]
Country of Incorporation	Israel
Percentage Owned	100.00%
Rafael Realty Holdings, Inc. [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	100.00%
Barer Institute, Inc. [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	100.00%
Pharma Holdings, LLC [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	90.00%
CS Pharma Holdings, LLC [Member]
Country of Incorporation	United States – Delaware
Percentage Owned	45.00%	[1]
Lipomedix Pharmaceuticals Ltd. [Member]
Country of Incorporation	Israel
Percentage Owned	57.90%

[1] 50% of CS Pharma Holdings, LLC is owned by Pharma Holdings, LLC. We have a 90% ownership in Pharma Holdings, LLC and, therefore, an effective 45% interest in CS Pharma Holdings, LLC.