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Redeemable Noncontrolling Interest (Details Narrative) - Common Class B [Member] - National Retail Solutions [Member] $ in Millions | Sep. 29, 2021 USD ($)
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Noncontrolling Interest [Line Items] |
Capital stock outstanding percentage | 2.50%
Sale of stock, consideration received on transaction | $ 10

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- Definition Sale of stock percentage of subsidiary equity issued in transaction. + References No definition available. + Details
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Namespace Prefix: | IDT_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=IDT_NationalRetailSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |