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Fair Value Measurements (Details Narrative) - USD ($) $ in Millions	Oct. 31, 2021	Jul. 31, 2021
Fair Value Disclosures [Abstract]
Investment in hedge funds	$ 2.8	$ 3.6

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- Definition

Investment in hedge funds.

+ References

No definition available.

+ Details

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Namespace Prefix:	IDT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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