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Equity Investments (Details) - Schedule of unrealized gains and losses for all equity investments - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019
Schedule of unrealized gains and losses for all equity investments [Abstract] |  |
Net (losses) gains recognized during the period on equity investments | $ (336) | $ 1,779
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 | $ (336) | $ 1,779

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | idt_EquitySecuritiesFvNiRecognizedGainLossNetOnEquitySecuritiesSold
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration