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Rafael Holdings, Inc. Spin-Off (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss before income taxes | $ 2,225 | $ 176 | $ 2,267 | $ (205)
Rafael Holdings, Inc. Spin-Off [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss before income taxes |  | (680) |  | (1,220)
Loss before income taxes attributable to IDT Corporation |  | $ (548) |  | $ (1,046)

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