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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | $ (3,744) |  |  |
Sale of interest in Fabrix Systems Ltd. |  |  |  | $ 640
Net other comprehensive income (loss) attributable to IDT Corporation | 1,401 |  | $ (5,544) | (2,999)
Ending balance | (2,343) |  | (3,744) |
Unrealized gain (loss) on available-for-sale securities [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | 8 |  | (575) | (8)
Sale of interest in Fabrix Systems Ltd. |  |  |  |
Zedge Spin-Off |  |  |  |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | 2,449 |  | 1,126 | (567)
Net other comprehensive income (loss) attributable to IDT Corporation | 2,126 | [1] | 583 |
Ending balance | 2,134 |  | 8 | (575)
Unrealized gain (loss) on available-for-sale securities [Member] | Other income (expense), net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income | (323) |  | (543) |
Foreign currency translation [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (3,752) |  | 1,346 | 3,676
Sale of interest in Fabrix Systems Ltd. |  |  |  | 102
Zedge Spin-Off |  |  | 1,029 |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | (725) |  | (6,127) | (2,432)
Net other comprehensive income (loss) attributable to IDT Corporation | (725) | [1] | (6,127) |
Ending balance | (4,477) |  | (3,752) | 1,346
Foreign currency translation [Member] | Other income (expense), net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income |  |  |  |
Accumulated other comprehensive income (loss) [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (3,744) |  | 771 | 3,668
Sale of interest in Fabrix Systems Ltd. |  |  |  | 102
Zedge Spin-Off |  |  | 1,029 |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | 1,724 |  | (5,001) |
Net other comprehensive income (loss) attributable to IDT Corporation | 1,401 | [1] | (5,544) | (2,999)
Ending balance | (2,343) |  | (3,744) | $ 771
Accumulated other comprehensive income (loss) [Member] | Other income (expense), net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income | $ (323) |  | $ (543) |
[1] | In fiscal 2017, net other comprehensive income attributable to IDT Corporation from unrealized gains on available-for-sale securities included unrealized gains on the Rafael convertible promissory notes of $2.1 million and unrealized gains, net on marketable securities of $26,000.

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- Definition The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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