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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015 | Jul. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 31,372 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  | $ 12,881 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Gross Unrealized Gains | 7 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains |  | 1 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains |
Gross Unrealized Losses | (3)idt_AvailableForSaleDebtSecuritiesGrossUnrealizedLosses |  | (9)idt_AvailableForSaleDebtSecuritiesGrossUnrealizedLosses |
Fair Value | 31,376 us-gaap_MarketableSecuritiesCurrent |  | 12,873 us-gaap_MarketableSecuritiesCurrent |
Certificates of Deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 19,290 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | [1] | 10,375 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | [1]
Gross Unrealized Gains | 1 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | [1] |  | [1]
Gross Unrealized Losses |  | [1] |  | [1]
Fair Value | 19,291 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | [1] | 10,375 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | [1]
Federal Home Loan Bank bond [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 995 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |  |  |
Gross Unrealized Gains |  |  |  |
Gross Unrealized Losses |  |  |  |
Fair Value | 995 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |  |  |
International agency notes [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,120 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = exch_XIMM |  |  |
Gross Unrealized Gains | 2 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = exch_XIMM |  |  |
Gross Unrealized Losses |  |  |  |
Fair Value | 1,122 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = exch_XIMM |  |  |
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  | 31 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Gross Unrealized Gains |  |  |  |
Gross Unrealized Losses |  |  | (9)idt_AvailableForSaleDebtSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Fair Value |  |  | 22 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Municipal Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 9,967 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 2,475 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Gross Unrealized Gains | 4 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 1 idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Gross Unrealized Losses | (3)idt_AvailableForSaleDebtSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  |  |
Fair Value | $ 9,968 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | $ 2,476 us-gaap_MarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
[1] | Each of the Company's certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

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