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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015 | Jul. 31, 2014
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents-short-term | $ 73,645 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 65,706 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Restricted cash and cash equivalents-long-term |  | 2,763 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Total restricted cash and cash equivalents | 73,645 us-gaap_RestrictedCashAndCashEquivalents | 68,469 us-gaap_RestrictedCashAndCashEquivalents
Restricted cash and cash equivalents-short-term [Member] | Related to letters of credit [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents-short-term | 3,201 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_LetterOfCreditMember | 665 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_LetterOfCreditMember
Restricted cash and cash equivalents-short-term [Member] | IDT Financial Services customer deposits [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents-short-term | 70,189 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_IDTFinancialServicesCustomerDepositsMember | 64,415 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_IDTFinancialServicesCustomerDepositsMember
Restricted cash and cash equivalents-short-term [Member] | Other [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents-short-term | $ 255 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_RestrictedOtherMember | $ 626 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = idt_RestrictedCashAndCashEquivalentsShortTermMember / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = idt_RestrictedOtherMember

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
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