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v2.4.1.9

Other Operating Gains, Net (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014
Other Operating Gains, Net (Textual) |  |
Proceeds from insurance |  | $ 571 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Gain on insurance claim |  | 600 idt_GainOnInsuranceSettlement2
New Jersey [Member] |  |
Other Operating Gains, Net (Textual) |  |
Proceeds from insurance |  | $ 600 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / us-gaap_StatementGeographicalAxis = country_JE

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- Definition Gain on Insurance Settlement2 + References No definition available. + Details
Name: | idt_GainOnInsuranceSettlement2
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | idt_OtherOperatingGainsLossNetTextualAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_JE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |