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Schedule of Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Cash and Cash Equivalents [Abstract]
Balance, beginning of period	$ 1,171	$ 964
Adjustment for observable transactions involving a similar investment from the same issuer	(521)	63
Balance, end of the period	$ 650	$ 1,027

X

- Definition

Adjustment for observable transactions involving similar investment from same issuer.

+ References

No definition available.

+ Details

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Namespace Prefix:	IDT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant