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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands | Oct. 31, 2018 | Jul. 31, 2018
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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Textual) |  |
Allowance for doubtful accounts | $ 2,027 | $ 2,192

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- References No definition available. + Details
Name: | idt_AssetsAndLiabilitiesHeldForSaleTextualAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount classified as allowance for doubtful accounts attributable to disposal group held for sale or disposed of. + References No definition available. + Details
Name: | idt_DisposalGroupIncludingDiscontinuedOperationAllowanceForDoubtfulAccounts
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant