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Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ 154,557 |
Dividends declared ($0.38 per share) |  |  | (9,440) |
Restricted Class B common stock purchased from employees |  |  | (61) |
Transfer of right to receive equity to Howard S. Jonas |  |  | (40) |
Consolidation of Lipomedix Pharmaceuticals Ltd. |  |  | 558 |
Distributions to noncontrolling interests |  |  | (717) |
Stock-based compensation |  |  | 1,797 |
Comprehensive income: |  |  |  |
Net loss | $ 1,690 | $ 1,257 | (106) | $ 23,552
Other comprehensive loss | 210 | 419 | (188) | (2,466)
Comprehensive income | 1,900 | $ 1,676 | (294) | $ 21,086
Ending Balance | 146,360 |  | 146,360 |
Attributable to IDT Corporation [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance |  |  | 145,734 |
Dividends declared ($0.38 per share) |  |  | (9,440) |
Restricted Class B common stock purchased from employees |  |  | (61) |
Transfer of right to receive equity to Howard S. Jonas |  |  |  |
Consolidation of Lipomedix Pharmaceuticals Ltd. |  |  |  |
Distributions to noncontrolling interests |  |  |  |
Stock-based compensation |  |  | 1,797 |
Comprehensive income: |  |  |  |
Net loss |  |  | (576) |
Other comprehensive loss |  |  | (188) |
Comprehensive income |  |  | (764) |
Ending Balance | 137,266 |  | 137,266 |
Noncontrolling Interests [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance |  |  | 8,823 |
Dividends declared ($0.38 per share) |  |  |  |
Restricted Class B common stock purchased from employees |  |  |  |
Transfer of right to receive equity to Howard S. Jonas |  |  | (40) |
Consolidation of Lipomedix Pharmaceuticals Ltd. |  |  | 558 |
Distributions to noncontrolling interests |  |  | (717) |
Stock-based compensation |  |  |  |
Comprehensive income: |  |  |  |
Net loss |  |  | 470 |
Other comprehensive loss |  |  |  |
Comprehensive income |  |  | 470 |
Ending Balance | $ 9,094 |  | $ 9,094 |

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