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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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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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