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Defined Contribution Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019
Disclosure Text Block Supplement [Abstract] |  |
Maximum percentage of participants contribution | 20.00% |
Percentage of discretionary matching contributions | 50.00% |
Defined benefit plan compensation | 6.00% |
Employment period contributions, description | first five years |
Company's cost for contributions to the plan (in Dollars) | $ 1.0 | $ 1.2

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- Definition Employment period contributions description. + 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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- Definition Defined contribution plan employer matching contribution limit percent. + References No definition available. + Details
Name: | idt_DefinedContributionPlanEmployerMatchingContributionLimitPercent
Namespace Prefix: | idt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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