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Sale of Interest in Fabrix Systems Ltd. (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) before income taxes | $ 1,064 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 9,194 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 86,566 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 20,517 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Fabrix Subsidiary [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) before income taxes |  | 296 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember | 917 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember | (1,380)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember
Income (loss) before income taxes attributable to IDT Corporation |  | $ 261 idt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItem / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember | $ 1,325 idt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItem / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember | $ (1,221)idt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItem / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember

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