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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss before income taxes | $ (2,201) | $ (6,614) | $ (2,405) | $ 4,282
IDT Financial Services Holding Limited [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss before income taxes | (3) | (631) | (1,012) | (457)
Loss before income taxes attributable to IDT Corporation | $ (3) | $ (631) | $ (1,012) | $ (457)

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