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Rafael Holdings, Inc. Spin-Off (Details Textual) - USD ($) shares in Thousands, $ in Thousands		1 Months Ended			12 Months Ended
	Mar. 02, 2017	Nov. 30, 2017	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016	Mar. 31, 2018	Sep. 19, 2017	Sep. 14, 2017
Rafael Holdings, Inc. Spin-Off (Textual)
Options to purchase aggregate common stock					1,243	1,273	360
Stock-based compensation expense					$ 3,581	$ 3,740	$ 2,680
Purchase price						10,000
Additional paid-in capital					294,047	394,462
Noncontrolling Interests [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Purchase price						7,250
Howard S. Jonas [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Percentage of direct and indirect interest	10.00%
Purchase price	$ 1,000
Howard S. Jonas [Member] | Additional Paid-in Capital [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Purchase of stock of subsidiary	200
Howard S. Jonas [Member] | Noncontrolling Interests [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Purchase of stock of subsidiary	$ 1,200
Rafael Pharmaceuticals, Inc. [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Maximum amount of investment					10,000
Convertible promissory note, rate of interest							3.50%
Convertible promissory note, principal amount							$ 2,000
CS Pharma Holdings, LLC [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Maximum amount of investment					$ 10,000
Noncontrolling interests						7,200
Additional paid-in capital						$ 2,800
Owned percentage			50.00%
CS Pharma Holdings, LLC [Member] | convertible promissory notes [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Additional amount of investment funded			$ 8,000	$ 8,000
Purchase shares of capital stock percentage					56.00%
Convertible promissory note, principal amount			$ 10,000
IDT-Rafael Holdings, LLC [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Percentage of contractual right to receive additional shares					10.00%
Percentage of non-operating subsidiary					90.00%
IDT-Rafael Holdings, LLC [Member] | Howard S. Jonas [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Percentage of contractual right to receive additional shares									9.00%	1.00%
Rafael Class B Common Stock [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Options to purchase aggregate common stock								600
Rafael Spin-Off [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Stock-based compensation expense					$ 200
Idt Corporation Option Holder [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Options to purchase aggregate common stock								1,300
Lipomedix Pharmaceuticals Ltd [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Percentage of non-operating subsidiary		50.60%
Idt Corporation [Member] | IDT-Rafael Holdings, LLC [Member]
Rafael Holdings, Inc. Spin-Off (Textual)
Percentage of contractual right to receive additional shares										9.00%

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