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v2.4.1.9

Commitments and Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Jul. 31, 2014
Commitments and Contingencies (Textual) |  |
Purchase commitment of company | $ 3,800 us-gaap_PurchaseObligation |
Letters of credit outstanding | 3,300 us-gaap_LettersOfCreditOutstandingAmount |
Letters of credit expiration date | Apr. 30, 2016 |
Performance bonds outstanding | 11,000 idt_PerformanceBondsOutstanding |
Refundable customer deposits | 68,817 us-gaap_CustomerDepositsCurrent | 62,685 us-gaap_CustomerDepositsCurrent
IDT Payment Services and IDT Financial Services [Member] |  |
Commitments and Contingencies (Textual) |  |
Restricted cash and cash equivalents | $ 9,500 idt_CashAndCashEquivalentsSubstantiallyRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_IdtPaymentServicesAndIdtFinancialServicesMember | $ 12,900 idt_CashAndCashEquivalentsSubstantiallyRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_IdtPaymentServicesAndIdtFinancialServicesMember

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- Definition The carrying amounts of cash and cash equivalent substantially restricted. + References No definition available. + Details
Name: | idt_CashAndCashEquivalentsSubstantiallyRestricted
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References No definition available. + Details
Name: | idt_LettersOfCreditExpirationDate
Namespace Prefix: | idt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition In certain circumstances, the company is required to provide performance bonds in connection with its contractual commitments. Company has indemnified the surety for any expenses paid out under these performance bonds. + References No definition available. + Details
Name: | idt_PerformanceBondsOutstanding
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CustomerDepositsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=idt_IdtPaymentServicesAndIdtFinancialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |