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Schedule of Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Cash and Cash Equivalents [Abstract]
Balance, beginning of period	$ 2,743	$ 4,109
Redemption for Visa mandatory release assessment		(1,870)
Adjustment for observable transactions involving a similar investment from the same issuer	(346)	(130)
Impairments
Balance, end of the period	$ 2,397	$ 2,109

X

- Definition

Adjustment for observable transactions involving a similar investment from the same issuer.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Redemption for Visa mandatory release assessment

+ References

No definition available.

+ Details

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Namespace Prefix:	IDT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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