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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Jul. 31, 2015
Accumulated Other Comprehensive Income [Abstract] |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |
(in thousands) |  | Unrealized loss on available-for- sale securities |  |  | Foreign currency translation |  |  | Accumulated other comprehensive income |
Balance at July 31, 2012 |  | $ | — |  |  | $ | 202 |  |  | $ | 202 |
Other comprehensive loss attributable to IDT Corporation |  |  | — |  |  |  | 2,139 |  |  |  | 2,139 |
Balance at July 31, 2013 |  |  | — |  |  |  | 2,341 |  |  |  | 2,341 |
Other comprehensive income attributable to IDT Corporation |  |  | (8 | ) |  |  | 1,335 |  |  |  | 1,327 |
Balance at July 31, 2014 |  |  | (8 | ) |  |  | 3,676 |  |  |  | 3,668 |
Sale of interest in Fabrix Systems Ltd. |  |  | — |  |  |  | 102 |  |  |  | 102 |
Other comprehensive income attributable to IDT Corporation |  |  | (567 | ) |  |  | (2,432 | ) |  |  | (2,999 | )
BALANCE AT JULY 31, 2015 |  | $ | (575 | ) |  | $ | 1,346 |  |  | $ | 771 |

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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=36458714&loc=SL7669686-108580 + Details
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