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Fair Value Measurements (Details Narrative) - USD ($) $ in Millions | Oct. 31, 2025 | Jul. 31, 2025
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Fair Value Disclosures [Abstract] |  |
Investments in hedge funds | $ 3.0 | $ 3.0

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