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Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Stock-based compensation				$ 1,774	$ 3,258
Selling, General and Administrative Expenses [Member]
Stock-based compensation	[1]	$ 768	$ 2,357	1,602	2,998
Technology and Development Expense [Member]
Stock-based compensation	[1]	$ 95	$ 130	$ 172	$ 260
[1] Stock-based compensation included in: Technology and development expense & Selling, general and administrative expense

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=IDT_TechnologyAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: