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Equity Investments (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |
Net (losses) gains recognized during the period on equity investments | $ (1,226) | $ 623 | $ (817) | $ 704
Less: net gains and losses recognized during the period on equity investments redeemed during the period |  |  |  |
Unrealized (losses) gains recognized during the period on equity investments still held at the reporting date | $ (1,226) | $ 623 | $ (817) | $ 704

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- Definition Amount of recognized gain (loss) net on equity securities (FV-NI). + References No definition available. + Details
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- Definition Amount of recognized gain (loss) net on equity securities which has been sold (FV-NI). + References No definition available. + Details
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- Definition Amount of recognized unrealized gain (loss) net on equity securities held (FV-NI). + References No definition available. + Details
Name: | idt_EquitySecuritiesFvNiRecognizedUnrealizedGainLossNetEquitySecuritiesHeld
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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