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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
(LOSS) INCOME BEFORE INCOME TAXES | $ 8,101 | $ 7,620 | $ 29,468
IDT Financial Services Holding Limited [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
(LOSS) INCOME BEFORE INCOME TAXES | (1,111) | (1,577) | 7,532
(LOSS) INCOME BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION | $ (1,111) | $ (1,577) | $ 7,532

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