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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jan. 31, 2019
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Foreign Currency Translation |  |  | Accumulated Other Comprehensive Loss |
|  | (in thousands) |
Balance, 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, August 1, 2018 |  |  | (1 | ) |  |  | (4,938 | ) |  |  | (4,939 | )
Other comprehensive income attributable to IDT Corporation |  |  | 1 |  |  |  | 483 |  |  |  | 484 |
Balance, January 31, 2019 |  | $ | — |  |  | $ | (4,455 | ) |  | $ | (4,455 | )

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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=114867106&loc=SL7669686-108580 + Details
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