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Defined Contribution Plans (Details Narrative) - USD ($) $ in Millions		12 Months Ended
	May 27, 2021	Jul. 31, 2021	Jul. 31, 2020
Employment period contributions, description		first five years
Defined Contribution Plan, Cost		$ 0.8	$ 1.0
Common Class B [Member]
Stock Issued During Period, Shares, New Issues	35,839
Stock Issued During Period, Value, New Issues	$ 1.0

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

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Number of new stock issued during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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X

- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

+ References

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