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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Jul. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive loss |
(in thousands) |  | Unrealized (loss) gain on available-for- sale securities |  |  | Foreign currency translation |  |  | Accumulated other comprehensive loss |
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 | )
Other comprehensive income (loss) attributable to IDT Corporation |  |  | 42 |  |  |  | (2,594 | ) |  |  | (2,552 | )
BALANCE AT JULY 31, 2020 |  | $ | 42 |  |  | $ | (7,452 | ) |  | $ | (7,410 | )

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