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Schedule of Equity Investments (Details) (Parenthetical) - Common Class B [Member] - shares |  | 12 Months Ended
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Apr. 29, 2025 | Jul. 31, 2025 | Jul. 31, 2024
Rafael Holdings Inc [Member] |  |  |
Number of related party shares received | 168,122 | 446,932 | 278,810
Zedge Inc [Member] |  |  |
Number of related party shares received |  | 42,282 | 42,282

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- Definition Number of related party shares received. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=IDT_RafaelHoldingsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |