XML 102 R66.htm IDEA: XBRL DOCUMENT
v3.19.3

Rafael Holdings, Inc. Spin-Off (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2017 | Nov. 30, 2017 | Sep. 30, 2016 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Mar. 31, 2018 | Sep. 19, 2017 | Sep. 14, 2017
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Options to purchase aggregate common stock |  |  |  | 1,223,000 | 1,243,000 |  |  |  |
Stock-based compensation expense |  |  |  | $ 2,236 | $ 3,581 | $ 3,740 |  |  |
Purchase price |  |  |  |  |  | 10,000 |  |  |
Purchase shares of capital stock percentage |  |  |  | 56.00% |  |  |  |  |
Additional paid-in capital |  |  |  | $ 273,313 | 294,047 |  |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 7,250 |  |  |
Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Percentage of direct and indirect interest | 10.00% |  |  |  |  |  |  |  |
Purchase price | $ 1,000 |  |  |  |  |  |  |  |
Howard S. Jonas [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Purchase of stock of subsidiary | 1,200 |  |  |  |  |  |  |  |
Howard S. Jonas [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Purchase of stock of subsidiary | $ 200 |  |  |  |  |  |  |  |
Rafael Class B Common Stock [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Options to purchase aggregate common stock |  |  |  |  |  |  | 600 |  |
Rafael Holdings Inc [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 200 |  |  |  |
Idt Corporation Option Holder [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Options to purchase aggregate common stock |  |  |  |  |  |  | 1,300 |  |
Lipomedix Pharmaceuticals Ltd [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Percentage of non-operating subsidiary |  | 50.60% |  |  |  |  |  |  |
IDT-Rafael Holdings, LLC [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Percentage of contractual right to receive additional shares |  |  |  | 10.00% |  |  |  |  |
Percentage of non-operating subsidiary |  |  |  | 90.00% |  |  |  |  |
IDT-Rafael Holdings, LLC [Member] | Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Percentage of contractual right to receive additional shares |  |  |  |  |  |  |  | 9.00% | 1.00%
IDT-Rafael Holdings, LLC [Member] | Idt Corporation [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Percentage of contractual right to receive additional shares |  |  |  |  |  |  |  |  | 9.00%
CS Pharma Holdings, LLC [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 10,000 |  |  |
Noncontrolling interests |  |  |  |  |  | 7,200 |  |  |
Additional paid-in capital |  |  |  |  |  | $ 2,800 |  |  |
Convertible promissory note, principal amount |  |  | $ 2,000 |  |  |  |  |  |
Owned percentage |  |  | 50.00% |  |  |  |  |  |
CS Pharma Holdings, LLC [Member] | Convertible Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Rafael Holdings, Inc. Spin-Off (Textual) |  |  |  |  |  |  |  |  |
Additional amount of investment funded |  |  | $ 8,000 |  |  |  |  |  |
Convertible promissory note, principal amount |  |  | $ 10,000 |  |  |  |  |  |

X
- Definition Percentage of contractual right to receive additional shares. + References No definition available. + Details
Name: | idt_ContractualRightToReceiveAdditionalSharesPercentage
Namespace Prefix: | idt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of direct and indirect interest. + References No definition available. + Details
Name: | idt_PercentageOfDirectAndIndirectInterest
Namespace Prefix: | idt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cash received on stock transactions. + References No definition available. + Details
Name: | idt_PurchaseOfStockOfSubsidiary
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase shares of capital stock. + References No definition available. + Details
Name: | idt_PurchaseSharesOfCapitalStock
Namespace Prefix: | idt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Remaining amount of investment. + References No definition available. + Details
Name: | idt_RemainingAmountOfInvestment
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AdditionalPaidInCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 + Details
Name: | us-gaap_MinorityInterestPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow resulting from the sale of an interest in a corporate unit during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfInterestInCorporateUnit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=idt_JonasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=idt_RafaelClassBCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=idt_RafaelHoldingsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=idt_IdtCorporationOptionHolderMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=idt_LipomedixPharmaceuticalsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=idt_IdtRafaelHoldingsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=idt_IdtCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | idt_InvestmentsAxis=idt_CsPharmaHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |