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Income Tax and New Jersey Corporation Business Tax (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Sep. 30, 2017
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
Benefit from income taxes |  | $ 1,029 | $ (2,162) | $ 931 | $ (14,817) |
Tax credits to be received |  |  |  |  |  | $ 21,100
Tax credit, description |  |  |  | In September 2017, the Company, IDT Domestic Telecom, Inc. (a subsidiary of the Company) and certain other affiliates, were certified by the New Jersey Economic Development Authority as having met all of the requirements of the Grow New Jersey Assistance Act Tax Credit Program. The corporation business tax credits to be received are a maximum of $21.1 million. The Company may claim a tax credit each tax year for ten years beginning in 2017. 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. |  |
Maximum [Member] |  |  |  |  |  |
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
U.S. federal statutory corporate tax rate |  |  |  | 35.00% |  |
Minimum [Member] |  |  |  |  |  |
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
U.S. federal statutory corporate tax rate |  |  |  | 21.00% |  |
Elmion Netherlands B.V. [Member] |  |  |  |  |  |
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
Benefit from income taxes |  |  |  |  | $ 16,600 |
AMT [Member] |  |  |  |  |  |
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
Noncurrent receivable |  | $ 3,300 |  | $ 3,300 |  |
Benefit from income taxes |  |  |  | $ 3,300 |  |
Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax and New Jersey Corporation Business Tax (Textual) |  |  |  |  |  |
U.S. federal statutory corporate tax rate | 26.90% |  |  |  |  |

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