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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jan. 31, 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 | ) |  |
Other comprehensive loss attributable to IDT Corporation before reclassifications |  |  | (159 | ) |  |  | (38 | ) |  |  | (197 | ) |  |
Less: reclassification for loss included in net loss |  |  | 9 |  |  |  | — |  |  |  | 9 |  |  | Other income (expense), net
Net other comprehensive loss attributable to IDT Corporation |  |  | (150 | ) |  |  | (38 | ) |  |  | (188 | ) |  |
Balance, January 31, 2018 |  | $ | 1,984 |  |  | $ | (4,515 | ) |  | $ | (2,531 | ) |  |

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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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