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v3.22.1

Redeemable Noncontrolling Interest (Details Narrative) - Common Class B [Member] - National Retail Solutions [Member] - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Sep. 29, 2021 | Feb. 28, 2022
Noncontrolling Interest [Line Items] |  |
Capital stock outstanding percentage | 2.50% | 0.50%
Sale of Stock, Consideration Received on Transaction | $ 10 |

X
- Definition Sale of stock percentage of subsidiary equity issued in transaction. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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