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Other Operating Expense, Net (Details) - Schedule of other operating expense, net - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019
Schedule of other operating expense, net [Abstract] |  |
Corporate —Straight Path Communications Inc. class action (legal fees net of insurance claims)/insurance claims net of legal fees | $ (531) | $ 326
net2phone—indemnification claim | (1,244) | (292)
net2phone—other, net | (63) | 25
Telecom & Payment Services—accrual for non-income related taxes related to a foreign subsidiary | (2,150) | (8,000)
Telecom & Payment Services—write-off of assets | (575) |
Telecom & Payment Services—accrual for legal matter | (500) |
Telecom & Payment Services—gain on sale of calling card business in Asia |  | 215
TOTAL | $ (5,063) | $ (7,726)

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- Definition Telecom & Payment Services accrual for legal matter. + References No definition available. + Details
Name: | idt_AccrualForLegalMatter
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- 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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- Definition Net2phone other net. + References No definition available. + Details
Name: | idt_Net2phoneOtherNet
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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- Definition Amount of Telecom and Payment Services - gain on sale of calling card business in Asia. + References No definition available. + Details
Name: | idt_SaleOfCallingCardBusinessInAsia
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 Telecom & Payment Services write off of assets. + References No definition available. + Details
Name: | idt_WriteoffOfAssets
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