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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jan. 31, 2021
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive (loss) income |
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Foreign Currency Translation |  |  | Accumulated Other Comprehensive Loss |
|  | (in thousands) |
Balance, July 31, 2020 |  | $ | 42 |  |  | $ | (7,452 | ) |  | $ | (7,410 | )
Other comprehensive income (loss) attributable to IDT Corporation |  |  | 17 |  |  |  | (1,564 | ) |  |  | (1,547 | )
Balance, January 31, 2021 |  | $ | 59 |  |  | $ | (9,016 | ) |  | $ | (8,957 | )

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