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Other Operating (Losses) Gains, Net (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 24, 2017 | Apr. 30, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Other Operating (Losses) Gains, Net (Textual) |  |  |  |  |
Expense related to legal settlement and mutual release, including legal fees |  | $ 10,100 |  |  |
Legal fees |  |  | $ 1,700 |  |
Sale of majority interests in New SPIP |  |  | 6,000 |  |
Gain on sale of interest |  |  |  |  | $ 1,086
Payment for transfer of the IP Interest |  |  | (6,000) |  |
Straight Path [Member] |  |  |  |  |
Other Operating (Losses) Gains, Net (Textual) |  |  |  |  |
Expense related to legal settlement and mutual release, including legal fees |  |  |  | 10,000 |
Legal fees related to the FCC investigation |  |  |  | 900 |
Proceeds related to FCC investigation |  |  |  | $ 500 |
Legal fees |  |  | $ 1,700 |  |
Aggregate cash paid | $ 16,000 |  |  |  |
Intellectual property net proceeds receive percentage | 22.00% |  |  |  |
Settlement agreement, description |  |  | The Settlement Agreement and Release allocates (i) $10 million of the payment and the retained interest right to the settlement of claims and the mutual release and (ii) $6 million to the transfer of the IP Interest. |  |
Payment for settlement of claims and mutual release | $ 10,000 |  |  |  |
Payment for transfer of the IP Interest | 6,000 |  |  |  |
Fabrix Systems Ltd. [Member] |  |  |  |  |
Other Operating (Losses) Gains, Net (Textual) |  |  |  |  |
Gain on sale of interest |  |  |  |  | $ 1,100
PR-SP IP Holdings LLC [Member] |  |  |  |  |
Other Operating (Losses) Gains, Net (Textual) |  |  |  |  |
Sale of majority interests in New SPIP | $ 6,000 |  |  |  |

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