Represents the amount of contingent payable of equity securities acquired during period.

No definition available.

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Namespace Prefix:	idt_
Data Type:	xbrli:monetaryItemType
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- Definition

Represents the amount of payments to acquire equity investments without readily determinable fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	idt_
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Period Type:	duration

- Definition

Maximum lending capacity for the receivable with imputed interest.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The number of related party shares that were purchased during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	idt_
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Balance Type:	na
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- Definition

The value of the related party shares purchased.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

+ Details

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Period Type:	duration

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of investment in equity security without readily determinable fair value.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of shares of investment owned.

+ References

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-SubTopic 210
-Name Accounting Standards Codification
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-Paragraph 6
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+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 19
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-19

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-SubTopic 10
-Topic 321
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479567/321-10-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The principal amount of the receivable or note before consideration of the discount or premium.

+ References

+ Details

Name:	us-gaap_ReceivableWithImputedInterestFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_ScheduleOfReceivablesWithImputedInterestNameOfReceivableWithImputedInterestAxis=idt_EquityMethodInvesteeRevolvingCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=idt_EquityInterestInPrivatelyOwnedIsraeliCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=idt_CommunicationCompanyEquityMethodInvesteeMember
Namespace Prefix:
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- Details

Name:	us-gaap_ConversionOfStockByUniqueDescriptionAxis=idt_ConversionOfVisaSeriesAPreferredStockIntoVisaSeriesACommonStockMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_FinancialInstrumentAxis=idt_RafaelClassBCommonStockMember
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- Details

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- Details

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Note 8 - Equity Investments (Details Textual) - USD ($)	1 Months Ended
Note 8 - Equity Investments (Details Textual) - USD ($)	Jan. 31, 2026	Jun. 30, 2025	Feb. 28, 2025	Aug. 31, 2024	Jul. 31, 2026	Jun. 30, 2026	Apr. 30, 2026	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023	Jun. 30, 2016
Equity Securities without Readily Determinable Fair Value, Amount					$ 1,347,000			$ 1,171,000	$ 964,000	$ 1,632,000
Equity Method Investee Revolving Credit Agreement [Member] \| Revolving Credit Facility [Member]
Receivable With Imputed Interest, Maximum Lending Capacity			$ 2,000,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)			12.00%
Equity Method Investee Revolving Credit Agreement [Member] \| Line of Credit [Member]
Receivable With Imputed Interest, Maximum Lending Capacity					2,200,000
Receivable with Imputed Interest, Face Amount					200,000	$ 100,000		$ 1,900,000
Long-Term Line of Credit					$ 2,200,000
Equity Interest in Privately Owned Israeli Company [Member]
Payments to Acquire Equity Investment Without Readily Determinable Fair Value	$ 500,000
Equity Securities Acquired During Period, Contingent Payable	500,000
Equity Securities without Readily Determinable Fair Value, Amount	$ 1,000,000
Communication Company Equity Method Investee [Member]
Equity Method Investment, Ownership Percentage					33.40%			33.40%
Equity Method Investment, Aggregate Cost							$ 8,200,000
Conversion of Visa Series A Preferred Stock into Visa Series A Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)				33
Conversion of Stock, Shares Issued (in shares)				3,300
Rafael Class B Common Stock [Member] \| Rafael Holdings, Inc. [Member]
Related Party Shares Purchased (in shares)		168,122
Related Party Shares Purchased, Value		$ 200,000
Visa Series C Preferred Stock [Member]
Investment Owned, Balance, Shares (in shares)											1,830
Visa Series A Preferred Stock [Member]
Investment Owned, Balance, Shares (in shares)									33
Visa Series A Common Stock [Member]
Proceeds from Sale of Equity Securities, FV-NI				$ 900,000