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Income Taxes (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Oct. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Sep. 30, 2017
Income Taxes (Textual) |  |  |  |  |  |  |
Federal net operating loss carryforwards |  |  |  | $ 155,000 |  |  |
Net operating loss carryforwards expiration date |  |  |  | 2018 |  |  |
Foreign net operating losses |  |  |  | $ 143,000 |  |  |
Foreign net operating loss, no expiration |  |  |  | 120,000 |  |  |
Foreign net operating loss, expiration in two to ten years |  |  |  | 22,000 |  |  |
Foreign net operating loss, expiration in twenty years |  |  |  | 1,000 |  |  |
Cumulative undistributed foreign earnings |  |  |  | $ 337,000 |  |  |
Tax credits to be received |  |  |  |  |  |  | $ 21,100
Tax credit, description |  |  |  | The Company may claim a tax credit each tax year for ten years beginning in 2018. The tax credit can be applied to 100% of the Company's New Jersey tax liability each year, and the unused amount of the annual credit can be carried forward. In addition, the Company may apply for a tax credit transfer certificate to sell unused tax credits to another business. The tax credits must be sold for no less than 75% of the value of the tax credits. |  |  |
(Provision for) benefit from income taxes |  | $ 1,200 | $ (3,300) | $ (123) | $ (2,902) | $ 2,021 |
Income tax expense on deferred tax assets |  |  |  |  |  |  |
U.S. federal statutory corporate tax rate |  |  |  |  | 26.90% |  |
U.S. federal statutory tax rate, thereafter |  |  |  |  | 21.00% |  |
Federal net operating loss carryforwards used to offset transition tax |  |  |  | 11,000 | $ 12,000 |  |
Decrease in deferred tax assets |  |  |  | 4,589 | 5,668 |  |
U.S. income |  |  |  | $ 600 |  |  |
Dividends received deduction for foreign source |  |  |  | 100.00% |  |  |
Net2phone [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
Net operating losses, federal |  |  |  | $ 70,000 |  |  |
Net operating losses expiration, description |  |  |  | Expire through fiscal 2027. |  |  |
Losses limited under internal revenue code |  |  |  | $ 7,000 |  |  |
Rafael Spin-Off [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
Decrease to deferred tax assets and valuation allowance |  |  |  |  | 6,000 |  |
US Deferred Tax Assets [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
Income tax expense on deferred tax assets |  |  |  |  |  | 11,100 |
Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
(Provision for) benefit from income taxes |  |  |  |  | $ 3,300 |  |
Elmion Netherlands B V [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
(Provision for) benefit from income taxes |  |  |  |  |  | $ 16,600 |
Minimum [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
U.S. federal statutory corporate tax rate | 21.00% |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |
U.S. federal statutory corporate tax rate | 35.00% |  |  |  |  |  |

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