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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017
IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Textual) |  |
Property, plant and equipment, net of accumulated depreciation | $ 346 | $ 228
Other intangibles, net of accumulated amortization | 86 | 57
IDT Financial Services Holding Limited [Member] |  |
IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Textual) |  |
Outstanding equity interests | 3,800 |
Allowance for doubtful accounts | 2,200 | $ 2,600
Net asset value | $ 13,700 |

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