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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
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Oct. 31, 2021 | Oct. 31, 2020
Fair Value Disclosures [Abstract] |  |
Balance, beginning of period | $ 2,465 | $ 3,825
Redemption for Visa mandatory release assessment |  | (1,870)
Total losses included in "Other expense, net" | (346) | (130)
Balance, end of period | 2,119 | 1,825
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 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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- References No definition available. + Details
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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 http://asc.fasb.org/extlink&oid=123874694&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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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Period Type: | instant