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Subsequent Event (Details Narrative) - Common Class B [Member] - National Retail Solutions [Member] $ in Millions	Sep. 29, 2021 USD ($) shares
Common stock shares sold | shares	862,442
Capital stock outstanding percentage	2.50%
Value of common stock shares sold | $	$ 10

X

- Definition

Sale of stock percentage of subsidiary equity issued in transaction.

+ References

No definition available.

+ Details

Name:	IDT_SaleOfStockPercentageOfSubsidiaryEquityIssuedInTransaction
Namespace Prefix:	IDT_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=IDT_NationalRetailSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: