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Defined Contribution Plan (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 23, 2020	Apr. 30, 2020
Defined Contribution Plan (Textual)
Maximum percentage of participants contribution		20.00%
Percentage of discretionary matching contributions		50.00%
Defined benefit plan compensation		6.00%
Company's cost for contributions to the plan	$ 1,000
Employment period contributions, description		First five years

X

- Definition

Employment period contributions description.

+ References

No definition available.

+ Details

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Namespace Prefix:	idt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	idt_DefinedContributionPlanTextualAbstract
Namespace Prefix:	idt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

X

- 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

X

- 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