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Sale of Interest in Fabrix Systems Ltd. (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) BEFORE INCOME TAXES | $ 92,203 | $ 24,992 | $ 33,950
Fabrix Subsidiary [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) BEFORE INCOME TAXES | 917 | (57) | (945)
INCOME (LOSS) BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION | $ 1,325 | $ 3 | $ (811)

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