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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Jul. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |
(in thousands) |  | Unrealized gain (loss) on available-for- sale securities |  |  | Foreign currency translation |  |  | Accumulated other comprehensive income (loss) |  |  | Location of (Gain) Loss Recognized
Balance at July 31, 2014 |  | $ | (8 | ) |  | $ | 3,676 |  |  | $ | 3,668 |  |  |
Sale of interest in Fabrix Systems Ltd. |  |  | — |  |  |  | 102 |  |  |  | 102 |  |  |
Other comprehensive loss attributable to IDT Corporation |  |  | (567 | ) |  |  | (2,432 | ) |  |  | (2,999 | ) |  |
Balance at July 31, 2015 |  |  | (575 | ) |  |  | 1,346 |  |  |  | 771 |  |  |
Zedge Spin-Off |  |  | — |  |  |  | 1,029 |  |  |  | 1,029 |  |  |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification |  |  | 1,126 |  |  |  | (6,127 | ) |  |  | (5,001 | ) |  |
Less: reclassification for gain included in net income |  |  | (543 | ) |  |  | — |  |  |  | (543 | ) |  | Other income (expense), net
Net other comprehensive income (loss) attributable to IDT Corporation |  |  | 583 |  |  |  | (6,127 | ) |  |  | (5,544 | ) |  |
Balance at July 31, 2016 |  |  | 8 |  |  |  | (3,752 | ) |  |  | (3,744 | ) |  |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification |  |  | 2,449 |  |  |  | (725 | ) |  |  | 1,724 |  |  |
Less: reclassification for gain included in net income |  |  | (323 | ) |  |  | — |  |  |  | (323 | ) |  | Other income (expense), net
Net other comprehensive income (loss) attributable to IDT Corporation (1) |  |  | 2,126 |  |  |  | (725 | ) |  |  | 1,401 |  |  |
BALANCE AT JULY 31, 2017 |  | $ | 2,134 |  |  | $ | (4,477 | ) |  | $ | (2,343 | ) |  |
| (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 Tabular disclosure of the components of accumulated 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 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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