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Sale of Interest in Fabrix Systems Ltd. (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Oct. 08, 2014 | Jun. 30, 2015 | Jul. 31, 2014
Sale of Interest in Fabrix Systems Ltd (Textual) |  |  |  |  |  |  |
Receivable from sale of interest in Fabrix Systems Ltd. | $ 31,686,000 idt_ReceivableFromDivestitureOfInterestInConsolidatedSubsidiaries |  | $ 31,686,000 idt_ReceivableFromDivestitureOfInterestInConsolidatedSubsidiaries |  |  |  |
Gain on sale of interest in Fabrix Systems Ltd. | 1,235,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary |  | 76,864,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary |  |  |  |
Cash received from divestiture of interest in consolidated subsidiaries parent only portion |  |  | 36,455,000 idt_CashReceivedFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion |  |  |  |
Fabrix Subsidiary [Member] |  |  |  |  |  |  |
Sale of Interest in Fabrix Systems Ltd (Textual) |  |  |  |  |  |  |
Common stock sold to Ericsson |  |  |  |  | 95,000,000 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Sale of stock to Ericsson in percentage |  |  |  |  | 100.00%idt_MinorityInterestCombinedOwnershipPercentageByParentAndNonControllingInterests / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Company owns in Fabrix in percentage |  |  |  |  | 78.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Escrow deposit |  |  |  |  | 13,000,000 us-gaap_EscrowDeposit / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Gain on sale of interest in Fabrix Systems Ltd. | 1,200,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |  |  | 76,900,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Proceeds from divestiture of interest in consolidated subsidiaries |  |  |  |  | 68,100,000 idt_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |
Cash received from divestiture of interest in consolidated subsidiaries parent only portion |  |  | 36,400,000 idt_CashReceivedFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |  |  |
Other receivables | 31,700,000 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  | 31,700,000 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember |  |  |  |
Fabrix Subsidiary [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Sale of Interest in Fabrix Systems Ltd (Textual) |  |  |  |  |  |  |
Cash received from divestiture of interest in consolidated subsidiaries parent only portion |  |  |  |  |  | $ 23,200,000 idt_CashReceivedFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion / us-gaap_StatementBusinessSegmentsAxis = idt_FabrixSubsidiaryMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition It represent cash received from divestiture of interest in consolidated subsidiaries parent only portion. + References No definition available. + Details
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- Definition Minority interest combined ownership percentage by parent and non controlling interests. + References No definition available. + Details
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- Definition The cash inflow associated with divestiture of interest in consolidated subsidiaries parent only portion. + References No definition available. + Details
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- Definition The aggregate amount of receivables to be collected from divestiture of interest in consolidated subsidiaries. + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (13)(g) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction. + References No definition available. + Details
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