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Other Operating (Expense) Gain, Net (Details Narrative) $ in Millions | Dec. 21, 2020 USD ($)
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Payment Card Interchange Fee and Merchant Discount Antitrust Litigation [Member] |
Loss Contingencies [Line Items] |
[custom:ProceedFromSaleToThirdParties] | $ 2.0

X
- Definition Proceed from sale to third parties. + References No definition available. + Details
Name: | IDT_ProceedFromSaleToThirdParties
Namespace Prefix: | IDT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=IDT_PaymentCardInterchangeFeeAndMerchantDiscountAntitrustLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |