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Income Taxes (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2016 | Jul. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Income Taxes (Textual) |  |  |  |  |  |
Federal and state net operating loss carryforwards |  |  |  | $ 180,000 |  |
Net operating loss carryforwards expiration date |  |  |  | 2018 |  |
Net operating losses expiration date |  |  |  | Jul. 31, 2038 |  |
Foreign net operating losses |  | $ 159,000 |  | $ 159,000 |  |
Foreign net operating loss, no expiration |  | 111,000 |  | 111,000 |  |
Foreign net operating loss, expiration in two to nine years |  | 47,000 |  | 47,000 |  |
Foreign net operating loss, expiration in twenty years |  | 1,000 |  | 1,000 |  |
Cumulative undistributed foreign earnings |  | 375,000 |  | 375,000 |  |
Accrued interest included in current income taxes payable |  |  |  |  |  |
Tax credits to be received | 24,300 |  |  |  |  |
Payments for investment in building | $ 5,300 |  |  |  |  |
Tax credit, description |  |  |  | In August 2016, the Company and the New Jersey Economic Development Authority entered into an incentive agreement pursuant to which the Company may receive corporation business tax credits in exchange for investment in a qualified business facility and employment of the required number of full-time employees. The corporation business tax credits to be received are a maximum of $24.3 million. The Company’s tax certificate documents are currently being reviewed by Economic Development Authority. The tax credits are based on an estimated capital investment of $5.3 million in addition to retaining, as well as creating, a number of full-time jobs. The Company may claim a tax credit each tax year for ten years beginning when the Economic Development Authority accepts the Company’s project completion certification. 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. The tax credits are subject to reduction, forfeiture and recapture if, among other things, the number of full-time employees declines below the program or statewide minimum. |  |
Benefit from income taxes |  |  | $ 16,600 | $ (2,021) | $ 4,110 | $ 6,088
Valuation allowance |  | 157,816 |  | 157,816 | 158,442 | 155,393
Income tax expense on deferred tax assets |  | $ 11,100 |  | 16,017 | $ 3,049 | $ 3,418
US Deferred Tax Assets [Member] |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |
Income tax expense on deferred tax assets |  |  |  | 11,100 |  |
Elmion Netherlands B.V. [Member] |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |
Benefit from income taxes |  |  |  | $ 16,600 |  |
Net2phone [Member] |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |
Net operating losses, Federal |  |  | $ 77,000 |  |  |
Net operating losses expiration description |  |  | Expire through fiscal 2027. |  |  |
Losses limited under internal revenue code |  |  | $ 7,000 |  |  |

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