XML 80 R69.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements (Details Narrative) - USD ($) $ in Millions | Oct. 31, 2021 | Jul. 31, 2021
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Investment in hedge funds | $ 2.8 | $ 3.6

X
- Definition Investment in hedge funds. + References No definition available. + Details
Name: | IDT_InvestmentInHedgeFunds
Namespace Prefix: | IDT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration