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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Jul. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |
(in thousands) |  | Unrealized (loss) gain on available-for- sale securities |  |  | Foreign currency translation |  |  | Accumulated other comprehensive income (loss) |  |  | Location of (Gain) Loss Recognized
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 | ) |  |
Rafael Spin-Off |  |  | (1,991 | ) |  |  | (279 | ) |  |  | (2,270 | ) |  |
Other comprehensive loss attributable to IDT Corporation before reclassification |  |  | (193 | ) |  |  | (182 | ) |  |  | (375 | ) |  |
Less: reclassification for loss included in net income |  |  | 16 |  |  |  | — |  |  |  | 16 |  |  | Other income (expense), net
Net other comprehensive loss attributable to IDT Corporation |  |  | (177 | ) |  |  | (182 | ) |  |  | (359 | ) |  |
Balance at July 31, 2018 |  |  | (34 | ) |  |  | (4,938 | ) |  |  | (4,972 | ) |  |
Adjustment from the adoption of change in accounting for equity investments (see Note 8) |  |  | 33 |  |  |  | — |  |  |  | 33 |  |  |
Adjusted balance at August 1, 2018 |  |  | (1 | ) |  |  | (4,938 | ) |  |  | (4,939 | ) |  |
Other comprehensive income attributable to IDT Corporation |  |  | 1 |  |  |  | 80 |  |  |  | 81 |  |  |
BALANCE AT JULY 31, 2019 |  | $ | — |  |  | $ | (4,858 | ) |  | $ | (4,858 | ) |  |
| (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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