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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Apr. 30, 2018
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive loss |
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Foreign Currency Translation |  |  | Accumulated Other Comprehensive Loss |  |  | Location of (Gain) Loss Recognized
|  | (in thousands)
Balance, July 31, 2017 |  | $ | 2,134 |  |  | $ | (4,477 | ) |  | $ | (2,343 | ) |  |
Rafael Spin-Off |  |  | (1,991 | ) |  |  | (279 | ) |  |  | (2,270 | ) |  |
Other comprehensive (loss) income attributable to IDT Corporation before reclassifications |  |  | (138 | ) |  |  | 138 |  |  |  | — |  |  |
Less: reclassification for loss included in net loss |  |  | 16 |  |  |  | — |  |  |  | 16 |  |  | Other (expense) income, net
Net other comprehensive (loss) income attributable to IDT Corporation |  |  | (122 | ) |  |  | 138 |  |  |  | 16 |  |  |
Balance, April 30, 2018 |  | $ | 21 |  |  | $ | (4,618 | ) |  | $ | (4,597 | ) |  |

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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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