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Defined Contribution Plan (Details Narrative) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2024 | Apr. 30, 2024
Retirement Benefits [Abstract] |  |
Employment period contributions, description |  | first five years
Employer discretionary contribution amount | $ 1.1 | $ 1.1

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- Definition Defined contribution plan employer discretionary contribution vesting period. + References No definition available. + Details
Name: | IDT_DefinedContributionPlanEmployerDiscretionaryContributionVestingPeriod
Namespace Prefix: | IDT_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration