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Schedule of Assets Measured at Fair Value On a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021
Fair Value Disclosures [Abstract] |  |  |  |
Balance, beginning of period | $ 2,261 | $ 2,319 | $ 2,465 | $ 3,825
Purchase of Rafael Holdings, Inc. warrant |  |  |  | 354
Exercise of Rafael Holdings, Inc. warrant |  | (380) |  | (380)
Redemption for Visa mandatory release assessment |  |  |  | (1,870)
Total (losses) gains recognized in “Other (expense) income, net” | (130) | 404 | (334) | 414
Balance, end of period | 2,131 | 2,343 | 2,131 | 2,343
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period |  |  |  |

X
- Definition Amount of change in unrealized gains or losses included in earnings for assets held at end of period. + References No definition available. + Details
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- Definition Exercise of rafael holdings inc warrant. + References No definition available. + Details
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Namespace Prefix: | IDT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase of Rafael Holdings Inc warrant. + References No definition available. + Details
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Namespace Prefix: | IDT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
Period Type: | duration

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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