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Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Income Tax Contingency [Line Items] |  |  |
Benefit from income taxes | $ 6,088 | $ 3,982 | $ 15,872
Federal and state net operating loss carryforwards | $ 170,000 |  |
Net operating loss carryforwards expiration date | 2016 |  |
Net operating losses expiration date | Jul. 31, 2036 |  |
Foreign net operating losses | $ 173,000 |  |
Foreign net operating loss, no expiration | 117,000 |  |
Foreign net operating loss, expiration in two to ten years | 56,000 |  |
Losses limited under Internal Revenue Code | 7,000 |  |
Cumulative undistributed foreign earnings | $ 353,000 |  |
Accrued interest included in current income taxes payable |  |  |
Net2Phone [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating losses expiration description | Expire through fiscal 2027. |  |
Net operating losses, Federal | $ 84,000 |  |
IDT Global [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Benefit from income taxes |  | $ 4,100 |

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