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Other Operating Gains, Net (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
Other Operating Gains, Net [Abstract] |  |  |  |  |  |  |  |
Telecom Platform Services-gain related to legal matters |  |  |  |  |  |  | $ 650 idt_GainLossRelatedToSettlementOfLegalMatter |
All Other-gain on insurance claim (a) |  | [1] |  | [1] |  | [1] | 571 idt_GainOnInsuranceClaim | [1]
All Other-other |  |  |  |  |  |  | 67 idt_AllOtherOtherOperatingGainsLossNet |
Corporate-losses related to legal matters | (1,552)idt_CorporateLossRelatedToSettlement |  |  |  | (1,552)idt_CorporateLossRelatedToSettlement |  | (79)idt_CorporateLossRelatedToSettlement |
Total | $ (1,552)idt_OtherOperatingLossGains |  |  |  | $ (1,552)idt_OtherOperatingLossGains |  | $ 1,209 idt_OtherOperatingLossGains |
[1] | In the nine months ended April 30, 2014, the Company received proceeds from insurance of $0.6 million related to water damage to portions of the Company's building and improvements at 520 Broad Street, Newark, New Jersey. The damage occurred in a prior period. The Company recorded a gain of $0.6 million from this insurance claim.

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- Definition Corporate loss related to settlement. + References No definition available. + Details
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- Definition Gain loss related to settlement of legal matter. + References No definition available. + Details
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- Definition Gain on insurance claim. + References No definition available. + Details
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- Details
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- Definition Other aggregate amounts of gains or losses resulting from operating activities not otherwise defined. + References No definition available. + Details
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