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Other Operating Expense, Net (Details) - Schedule of other operating expense, net - USD ($) $ in Thousands | 3 Months Ended
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Oct. 31, 2020 | Oct. 31, 2019
Schedule of other operating expense, net [Abstract] |  |
Corporate—Straight Path Communications Inc. class action insurance claims net of legal fees/(legal fees net of insurance claims) | $ 302 | $ (260)
Traditional Communications—Carrier Services settlement | (554) |
Traditional Communications—net2phone indemnification claim |  | (365)
Traditional Communications—accrual for non-income related taxes related to a foreign subsidiary |  | (2,150)
Total other operating expense, net | $ (252) | $ (2,775)

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- Definition Accrual for non income related taxes. + References No definition available. + Details
Name: | idt_AccrualForNonIncomeRelatedTaxes
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (loss) in period from legal fees net of insurance claims. + References No definition available. + Details
Name: | idt_GainLossInPeriodFromLegalFeesNetOfInsuranceClaims
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | idt_Net2phoneindemnificationClaim
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Traditional Communications—Carrier Services settlement + References No definition available. + Details
Name: | idt_TraditionalCommunicationsCarrierServicesSettlement
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
Name: | us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration