Document And Entity Information
Reclassified From Prepaid Expenses [Member]
Represents the reclassification from prepaid expenses.
Reclassified from Prepaid Expenses, Other Current Assets, and Other Assets [Member]
Represents the reclassification from prepaid expenses, other current assets, and other assets during the period.
Statistical Measurement [Axis]
Note To Financial Statement Details Textual
srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Share Repurchase Program, Authorized, Number of Shares (in shares)
Significant Accounting Policies
Interest income
idt_IncreaseDecreaseInSettlementAssetsAndDisbursementPrefunding
Increase (Decrease) in Settlement Assets and Disbursement Prefunding
Amount of change in settlement assets and disbursement funding during the period.
Note 3 - Business Segment Information
us-gaap_IncomeTaxExpenseBenefit
Provision for income taxes
Hedge Funds [Member]
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Note 4 - Revenue Recognition
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Note 5 - Leases
us-gaap_RestrictedCashAndCashEquivalents
Total restricted cash and cash equivalents
Trading Arrangements, by Individual [Table]
Note 6 - Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents
Retirement Benefits [Text Block]
Material Terms of Trading Arrangement [Text Block]
Note 7 - Debt Securities
Note 8 - Equity Investments
Financial Instrument [Axis]
Note 9 - Fair Value Measurements
Investment in Debt and Equity Securities and Other Trading Assets [Text Block]
us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)
Note 10 - Variable Interest Entity
Note 11 - Other Operating Income (Expense), Net
Minimum [Member]
Note 13 - Redeemable Noncontrolling Interest
Product and Service, Other [Member]
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Losses
Note 15 - Earnings Per Share
Gross Unrealized Gains
us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Foreign currency transaction (losses) gains
Oncore Digital Inc [Member]
Represents the Oncore Digital Inc acquisition.
Statistical Measurement [Domain]
Note 16 - Accumulated Other Comprehensive Loss
Maximum [Member]
Note 18 - Other Income, Net
Note 3 - Business Segment Information - Schedule of Business Segment Operations (Details)
Share Repurchase Program [Axis]
Note 4 - Revenue Recognition - Disaggregated Revenues by Segment (Details)
Equity in the net loss of MarketSpark
Amortization and equity in net loss of MarketSpark
Share Repurchase Program [Domain]
Note 4 - Revenue Recognition - Revenues by Geographic Region (Details)
us-gaap_IncreaseDecreaseInAccountsReceivable
Increase (Decrease) in Accounts Receivable
Trade accounts receivable
Note 4 - Revenue Recognition - Schedule of Remaining Performance Obligations (Details)
Note 4 - Revenue Recognition - Schedule of Remaining Performance Obligations 2 (Details)
Note 4 - Revenue Recognition - Schedule of Remaining Performance Obligations (Details) (Parentheticals)
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Trade accounts payable, accrued expenses, settlement liabilities, other current liabilities, and other liabilities
Schedule of Investments [Table]
Note 4 - Revenue Recognition - Schedule Of Contract Liability (Details)
Note 4 - Revenue Recognition - Deferred Customer Contract Acquisition Costs (Details)
Note 4 - Revenue Recognition - Schedule of Amortization of Deferred Customer Contracts (Details)
Note 5 - Leases - Lease Costs (Details)
Note 5 - Leases - Aggregate Operating Lease Liability (Details)
Note 5 - Leases - Schedule of Operating Lease Liability Maturity (Details)
Basis of Presentation and Significant Accounting Policies [Text Block]
Note 6 - Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents - Schedule of Restricted Cash (Details)
Note 7 - Debt Securities - Schedule of Available-For-Sale Debt Securities (Details)
Note 7 - Debt Securities - Schedule of Debt Security Maturity (Details)
Note 7 - Debt Securities - Schedule of Unrealized Loss Position (Details)
Note 8 - Equity Investments - Equity Investments (Details)
Note 8 - Equity Investments - Equity Investments (Details) (Parentheticals)
Note 8 - Equity Investments - Equity Securities Without Readily Determined Fair Value (Details)
Note 8 - Equity Investments - Schedule of Unrealized Gain (Loss) for Equity Method Investments (Details)
Note 8 - Equity Investments - Schedule of Equity Method Investments (Details)
Note 9 - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details)
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Note 9 - Fair Value Measurements - Schedule of Assets Measured (Details)
Note 9 - Fair Value Measurements - Schedule of Liabilities Measured (Details)
Debt Securities, Available-for-Sale [Table]
Note 10 - Variable Interest Entity - Schedule of Financial Statement Information (Details)
Note 11 - Other Operating Income (Expense), Net - Schedule of Other Operating Expenses (Details)
Note 13 - Redeemable Noncontrolling Interest - Schedule of Noncontrolling Interest (Details)
Note 15 - Earnings Per Share - Schedule of Earnings Per Share (Details)
Note 16 - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details)
idt_Lesseeoperatingleaseliabilitypaymentsdueafterrollingyearfour
Thereafter
Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fourth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.
Note 18 - Other Income, Net - Schedule of Other Expenses (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
idt_EquitySecuritiesAcquiredDuringPeriodContingentPayable
Equity Securities Acquired During Period, Contingent Payable
Represents the amount of contingent payable of equity securities acquired during period.
Equity Interest in Privately Owned Israeli Company [Member]
Represents the equity interest in privately owned Israeli company.
Financial Instruments [Domain]
us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Lessee, Operating Lease, Remaining Lease Term (Year)
Dividends declared per share (in dollars per share)
Common Stock, Dividends, Per Share, Declared (in dollars per share)
Non Vested Restricted Common Stock [Member]
Represents non-vested restricted common stock.
Upward adjustment
Segment Reporting [Text Block]
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Debt securities, fair value 12 months or longer
Impairments
Award Type [Axis]
Segment Reporting [Table Text Block]
idt_PercentageOfMarketPriceRelativeToGrantPrice
Percentage of Market Price Relative to Grant Price
Represents the percentage of market price relative to the grant price.
Adjustments to reconcile net income to net cash from operating activities:
Preferred stock, $.01 par value; authorized shares - 10,000; no shares issued
Plan Name [Axis]
us-gaap_Liabilities
Total liabilities
Plan Name [Domain]
Defined Benefit Plan [Table]
(i) Stock-based compensation included in total operating expenses
Consolidation Items [Axis]
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and noncontrolling interests
Cash and Cash Equivalent [Table]
Title and Position [Axis]
Segment Reporting [Table]
Certain Executive Officers [Member]
Represents certain executive officers.
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses, other current assets, and other assets
Rafael Holdings, Inc. [Member]
Represents Rafael Holdings, Inc.
Stock-based compensation expense
Selling, general, and administrative (i)
Selling, general and administrative
Selling, general and administrative
Consolidation Items [Domain]
Adjustment for observable transactions involving a similar investment from the same issuer
The amount of adjustments for the observable transactions involving similar investments from the same issuer in equity security without readily determinable fair value.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)
Lessee, Lease, Description [Table]
idt_RelatedPartySharesPurchased
Related Party Shares Purchased (in shares)
The number of related party shares that were purchased during the period.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum
Other Marketable Equity Securities [Member]
Represents the other marketable securities.
Reclassification, Type [Axis]
Redemptions
Amount of redemption value on investment in equity security without readily determinable fair value.
Reclassification, Type [Domain]
idt_RelatedPartySharesPurchasedValue
Related Party Shares Purchased, Value
The value of the related party shares purchased.
idt_AmortizationOfEquityMethodInvestments
Amortization of equity method basis difference
Amount of amortization for the equity method investments.
Change in operating assets and liabilities:
Preferred stock, issued (in shares)
Variable Interest Entity Disclosure [Text Block]
Preferred stock, authorized (in shares)
Fair Value, by Balance Sheet Grouping [Table]
Preferred stock, par value (in dollars per share)
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase in cash, cash equivalents, and restricted cash and cash equivalents
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance, beginning of period
Balance, end of period
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Total cash, cash equivalents, and restricted cash and cash equivalents
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
Aggregate funding provided by the Company, net
us-gaap_OtherExpenses
Traditional Communications
us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Other current liabilities
us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)
us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Other noncurrent liabilities
Amended and Restated Employment Agreement [Member]
Represents the Amended and Restated Employment Agreement.
Mr. Pereira [Member]
Represents the person named Mr. Pereira.
US Government-sponsored Enterprises Debt Securities [Member]
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash and cash equivalents, beginning of period
Cash, cash equivalents and restricted cash and cash equivalents, end of period
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table]
idt_AccruedProceedsFromMilestone
Accrued Proceeds from Milestone
Represents the amount of accrued proceed form the milestone reached.
Statement [Table]
Reclassification, Comparability Adjustment [Policy Text Block]
Credit Facility [Axis]
Operating cash flows from operating leases
Credit Facility [Domain]
Rafael Holdings, Inc. Class B Common Stock [Member]
Represents the Rafael Holdings, Inc. (“Rafael”) Class B common stock.
Revolving Credit Facility [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Zedge, Inc. Class B Common Stock [Member]
Represents the Zedge, Inc. Class B common stock.
Prepaid expenses
Prepaid expenses
idt_PaymentsToAcquireEquityInvestmentWithoutReadilyDeterminableFairValue
Payments to Acquire Equity Investment Without Readily Determinable Fair Value
Represents the amount of payments to acquire equity investments without readily determinable fair value.
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Debt securities, unrealized loss
idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Granted in Period, Total Fair Value
Represents the total fair value of equity instruments other than options granted in the period under a share based payment arrangement.
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
NRS On Core [Member]
Represents NRS OnCore.
us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
us-gaap_EquityMethodInvestments
Balance, beginning of period
Balance, end of period
Debt securities, fair value
us-gaap_InvestmentsFairValueDisclosure
Total
idt_PaymentsToAcquireEquityInvestmentsWithoutReadilyDeterminableFairValue
Purchase of equity investments
Represents the amount of payments to acquire equity investments without readily determinable fair value.
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Equity investments
Equity investments, current
Equity investments in current assets
Line of Credit Facility, Lender [Domain]
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
Certain Employees [Member]
Represents certain employees.
idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesExchangePercentageOfSharesOnDilutedBasis
Share Based Compensation Arrangement By Share Based Payment Award, Shares Exchange Percentage of Shares on Diluted Basis
Represents the percentage of shares on diluted basis exchanged under a share based compensation arrangement.
idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesExchangedPercentageOfSharesOnSharesIssuedAndOutstandingBasis
Share Based Compensation Arrangement By Share Based Payment Award, Shares Exchanged, Percentage of Shares on Shares Issued and Outstanding Basis
Represents the percentage of shares on shares issued and outstanding basis of shares exchanged under a share based compensation arrangement.
Communication Company Equity Method Investee [Member]
Represents the equity method investee for the communication company.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)
Lender Name [Axis]
Redeemable Noncontrolling Interest [Table Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)
Less: net gains (losses) recognized during the period on equity investments sold during the period
Stock issued to an executive officer for bonus payment
Net gains recognized during the period on equity investments
Product and Service [Domain]
Product and Service [Axis]
Ownership [Axis]
us-gaap_LineOfCredit
Long-Term Line of Credit
Ownership [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Share-Based Payment Arrangement, Plan Modification, Incremental Cost
us-gaap_LegalFees
Straight Path Communications Inc. class action legal fees
Consolidated Entities [Axis]
Line of Credit [Member]
Consolidated Entities [Domain]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Unrealized gains recognized during the period on equity investments still held at the reporting date
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
Weighted-average discount rate - operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths
2027
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour
2030
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree
2029
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Measurement Frequency [Axis]
Commitments and Contingencies Disclosure [Text Block]
Statement [Line Items]
Fair Value Hierarchy and NAV [Axis]
Common stock, issued (in shares)
Award Type [Domain]
Common stock, outstanding (in shares)
Common stock, authorized (in shares)
Common Class B [Member]
Rafael Class B Common Stock [Member]
Represents Rafael Class B Common Stock.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Common stock
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
Trade accounts payable
Trade accounts payable
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_TableTextBlock
Notes Tables
Comprehensive Income (Loss) Note [Text Block]
Proceeds from borrowings under revolving credit facility
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income attributable to IDT Corporation
Proceeds from borrowings
Capital expenditures
Capital expenditures
Accrued expenses
Accrued expenses
Nonrelated Party [Member]
Related Party [Member]
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest
Operating lease liabilities
Operating lease liabilities included in noncurrent liabilities
us-gaap_OperatingLeaseLiability
Total
Total operating lease liabilities
us-gaap_OperatingLeaseLiabilityCurrent
Operating lease liabilities included in "Other current liabilities"
us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Net income of NRS attributable to the mezzanine equity's noncontrolling interest
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Balance, beginning of period
Balance, end of period
Other intangibles, net
Other intangibles, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Amortized Cost
Other comprehensive income (loss):
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
us-gaap_LongTermInvestments
Noncurrent equity investments
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
"Foreign currency translation adjustments"
Stock Conversion Description [Axis]
Statement of Stockholders' Equity [Abstract]
us-gaap_EquitySecuritiesFVNINoncurrent
Equity investments, noncurrent
Statement of Comprehensive Income [Abstract]
us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Equity Securities, FV-NI
Conversion of Stock, Name [Domain]
Statement of Cash Flows [Abstract]
UNITED KINGDOM
Equity Components [Axis]
idt_DefinedBenefitPlansMatchingContributionVestingPeriod
Defined Benefit Plans, Matching Contribution Vesting Period (Year)
The vesting period for the matching contribution in the defined benefit plan.
Proceeds from exercise of stock options
idt_PerformanceBondsOutstanding
Performance Bonds Outstanding
Amount related to the performance bonds.
Equity Component [Domain]
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Equity [Text Block]
AOCI Attributable to Parent [Member]
Fair Value, Inputs, Level 1 [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Settlement assets, net of reserve of $1,816 at April 30, 2026 and $1,367 at July 31, 2025
Property, plant, and equipment, net
Property, plant, and equipment, net
Settlement liabilities
Class A and Class B Common Stock [Member]
Represents the Class A and Class B common stock.
Deferred income tax assets, net
Other Operating Income and Expense [Text Block]
Provision for credit losses and reserve for settlement assets
Direct cost of revenues
Direct cost of revenues
Direct cost of revenues
Equity:
Fair Value Option, Disclosures [Table]
Fair Value Disclosures [Text Block]
Share-Based Payment Arrangement, Option [Member]
Supplemental cash flow information
Current liabilities:
us-gaap_GainLossOnInvestments
Gains on investments, net
us-gaap_LiabilitiesCurrent
Total current liabilities
Trade accounts receivable, net of allowance for credit losses of $8,039 at April 30, 2026 and $9,097 at July 31, 2025
Accounts Receivable, after Allowance for Credit Loss, Current
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block]
us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi
Proceeds from Sale of Equity Securities, FV-NI
Lease, Cost [Table Text Block]
Severance
Purchase of convertible preferred stock
Purchase of convertible preferred stock in equity method investment
Other Commitments [Table]
us-gaap_PaymentsToAcquireInvestments
Purchases of debt securities and equity securities
Accumulated other comprehensive loss
Accumulated other comprehensive income
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income taxes
Additional paid-in capital
Debt Disclosure [Text Block]
us-gaap_OtherOperatingIncomeExpenseNet
Other operating (income) expense, net (see Note 11)
Total other operating income (expense)
Noncontrolling interests
Noncontrolling interests
Customer fund deposits
Customer funds deposits
Unrealized Gain (Loss) on Investments [Table Text Block]
Noncontrolling Interest Disclosure [Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
us-gaap_StockIssuedDuringPeriodValueNewIssues
Stock Issued During Period, Value, New Issues
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures
Lessee, Operating Leases [Text Block]
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Stock-based compensation
us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Distributions to noncontrolling interests
Distributions to noncontrolling interests
us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Subsidiary, Ownership Percentage, Noncontrolling Owner
UNITED STATES
us-gaap_MinorityInterestOwnershipPercentageByParent
Subsidiary, Ownership Percentage, Parent
Non-US [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]
Noncontrolling Interest [Table]
Current assets:
Stock options exercised
us-gaap_AssetsCurrent
Total current assets
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)
Fair Value, Recurring and Nonrecurring [Table]
us-gaap_GrossProfit
Gross profit
us-gaap_StockIssuedDuringPeriodSharesNewIssues
Stock Issued During Period, Shares, New Issues (in shares)
Class of Stock [Domain]
Related and Nonrelated Parties [Axis]
us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Shares, Acquired (in shares)
us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
Net income
Schedule of Long-Term Debt Instruments [Table]
Redeemable Noncontrolling Interest [Table]
Redeemable noncontrolling interest
Operating activities:
Investing activities:
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
Financing activities:
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Write-off of equipment
Name of Receivable with Imputed Interest [Domain]
Operating Segments [Member]
Accounting Policies [Abstract]
Segments [Domain]
Accounting Standards Update and Change in Accounting Principle [Text Block]
Schedule of Receivables with Imputed Interest, Name of Receivable with Imputed Interest [Axis]
Allowance for credit losses
US Treasury Securities [Member]
Segments [Axis]
us-gaap_ReceivableWithImputedInterestFaceAmount
Receivable with Imputed Interest, Face Amount
Income Statement [Abstract]
us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
Receivable with Imputed Interest, Effective Yield (Interest Rate)
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Deferred income taxes
us-gaap_PurchaseObligation
Purchase Obligation
us-gaap_TreasuryStockCommonValue
Treasury stock, at cost, consisting of 1,698 and 1,698 shares of Class A common stock and 5,274 and 4,872 shares of Class B common stock at April 30, 2026 and July 31, 2025, respectively
us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Share Repurchase Program, Remaining Authorized, Number of Shares (in shares)
Treasury stock, common shares (in shares)
Treasury Stock, Common [Member]
us-gaap_NetIncomeLoss
Net income attributable to IDT Corporation
Common Class A [Member]
us-gaap_OtherNoncashIncomeExpense
Other
Contract with Customer, Asset, Past Due [Table]
us-gaap_ConversionOfStockSharesConverted1
Conversion of Stock, Shares Converted (in shares)
Accumulated Other Comprehensive Income (Loss) [Table]
us-gaap_ConversionOfStockSharesIssued1
Conversion of Stock, Shares Issued (in shares)
Value of the Company's DSUs exchanged for National Retail Solutions shares
Income Tax Disclosure [Text Block]
us-gaap_BusinessCombinationContingentConsiderationLiability
Total
Accounting Standards Update and Change in Accounting Principle [Table]
Visa Series C Preferred Stock [Member]
Represents the Visa series C preferred stock.
Conversion of Visa Series A Preferred Stock into Visa Series A Common Stock [Member]
The conversion of Visa's series A preferred stock into Visa series A common stock.
Visa Series A Preferred Stock [Member]
The Visa series A preferred stock.
Disbursement prefunding
Disbursement prefunding
The amount of disbursement prefunding recognized.
Non-Cash Financing Activities
Equity Method Investee Revolving Credit Agreement [Member]
The revolving credit agreement with the equity method investee.
Reserve
The reserve amount for the settlement assests.
Related and Nonrelated Parties [Domain]
Visa Series A Common Stock [Member]
Represents the Visa series A common stock.
Distributions to noncontrolling interests
Exchange of NRS shares for IDT DSUs
Amount of increase (decrease) to additional paid in capital (APIC) resulting from the exchange of stock options.
us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury Stock, Value, Acquired, Cost Method
Repurchases of common stock
Employee Repurchase Program [Member]
Represents the employee repurchase program.
Repurchase Program [Member]
Represents the repurchase program.
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
National Retail Solutions [Member]
Represents National Retail Solutions.
Net2phone 2.0 [Member]
Represents net2phone 2.0.
Traditional Communications [Member]
Represents the Traditional Communications segment.
Fintech [Member]
Represents the fintech segment.
Fair Value Hierarchy and NAV [Domain]
idt_FullyDilutedMinorityInterestOwnershipPercentageParent
Fully Diluted Minority Interest Ownership, Percentage, Parent
Fully diluted interest in net assets of the subsidiary, expressed as a percentage.
Measurement Frequency [Domain]
Other [Member]
Represents the other options.
BOSS Money [Member]
Represents BOSS money.
TD Bank, N.A [Member]
Represents TD Bank N.A.
us-gaap_RepaymentsOfLinesOfCredit
Repayments of Lines of Credit
Repayments on borrowings under revolving credit facility
BOSS Revolution [Member]
Represents the BOSS Revolution.
Statement of Financial Position [Abstract]
IDT Digital Payments [Member]
Represents the IDT Digital Payments.
idt_PolicyTable
Net2phone [Member]
Represents the net2phone segment.
Schedule of Variable Interest Entities [Table Text Block]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Total gains included in "Other income, net"
Income taxes paid
IDT Global [Member]
Represents the IDT Global.
us-gaap_DividendsCommonStock
Dividends declared
us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Repayments of borrowings
Variable Interest Entity, Primary Beneficiary [Member]
Mutual Fund [Member]
Schedule of Amortization of Deferred Customer Contracts [Table Text Block]
The tabular disclosure presenting the amortization expense for the deferred customer contracts.
Variable Interest Entity [Table]
Aggerate Operating Lease Liability [Table Text Block]
The tabular disclosure presenting the aggregate operating lease liability.
idt_LeverageRatio
Leverage Ratio
Represents the leverage ratio for the debt instrument.
idt_PercentageOfOutstandingStock
Percentage of Outstanding Stock
Represents the percent of outstanding stock.
Fair Value, Recurring [Member]
us-gaap_PaymentsToMinorityShareholders
Distributions to noncontrolling interests
Other assets
Disbursement Payments VIE [Member]
Represents the Disbursement Payments VIE.
IDT Financial Services Gibraltar [Member]
Represents IDT Financial Services (Gibraltar).
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchases of common stock
NRS [Member]
Represents NRS.
Document Type
Operating expenses:
Document Information [Line Items]
Document Quarterly Report
Weighted-average remaining lease term - operating leases (years) (Year)
Document Information [Table]
Period (Year)
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Entity Interactive Data Current
Document Transition Report
Diluted (in shares)
Diluted weighted-average number of shares (in shares)
us-gaap_OperatingExpenses
Total operating expenses
Earnings per share attributable to IDT Corporation common stockholders:
Stock options (in shares)
Basic (in shares)
Basic (in dollars per share)
Shares of the Company's Class B common stock issued to executive officer for bonus
Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]
Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table]
Effective Income Tax Rate Reconciliation [Table]
Title and Position [Domain]
The 2024 Equity incentive Plan [Member]
The 2024 Equity incentive Plan
Debt Securities, Available-for-Sale [Table Text Block]
Equity Securities without Readily Determinable Fair Value [Table Text Block]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
us-gaap_InsuranceCommissions
Straight Path Communications Inc. class action insurance claims
Restrictions on Cash and Cash Equivalents [Table Text Block]
Document Fiscal Period Focus
Document Fiscal Year Focus
Investment, Name [Domain]
us-gaap_DepreciationAndAmortization
Depreciation and amortization
Restrictions on Cash and Cash Equivalents [Table]
Restricted cash and cash equivalents
Restricted cash
Amendment Flag
Restricted Cash and Cash Equivalents [Axis]
Equity Securities without Readily Determinable Fair Value [Table]
us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period
Common Stock [Member]
Deferred Stock Units (DSUs) [Member]
Deferred Stock Units (DSUs)
us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Change in unrealized gains or losses for the period included in earnings for liabilities at the end of the period
idt_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value
The fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
Goodwill
Document Period End Date
Investment [Table Text Block]
Legal Entity [Axis]
Operating lease cost
us-gaap_OperatingLeaseCost
Short-term lease cost
us-gaap_ShortTermLeaseCost
Executive Officers and Other Employees [Member]
Executive Officers and Other Employees
us-gaap_LeaseCost
Total lease cost
Business Combination [Domain]
Entity File Number
us-gaap_RevenueRemainingPerformanceObligation
Total
Entity Tax Identification Number
Business Combination [Axis]
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue [Table]
Entity [Domain]
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Debt securities, unrealized loss 12 months or longer
Entity Central Index Key
Entity Registrant Name
us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Equity Securities without Readily Determinable Fair Value, Amount
Balance
Balance
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Entity Current Reporting Status
Business Combination [Table]
us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Debt Securities, Available-for-Sale, Realized Gain (Loss)
idt_OtherSegmentItems
Other segment items
Other segment items
Other segment items
Amount of other segment items.
Entity Incorporation, State or Country Code
Current Fiscal Year End Date
Purchase
Amount of redemption value for mandatory release assessments on investment in equity security without readily determinable fair value.
Technology and development (i)
Technology and development
Technology and development
Entity Filer Category
Entity Shell Company
Entity Emerging Growth Company
us-gaap_EquityMethodInvestmentAggregateCost
Equity Method Investment, Aggregate Cost
Other comprehensive income attributable to IDT Corporation
Other comprehensive income (loss)
Entity Small Business
Cash and Cash Equivalents [Domain]
us-gaap_OperatingIncomeLoss
Income from operations
Income (loss) from operations
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Revenue recognized
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred
Entity Address, State or Province
Entity Address, City or Town
Marketable Securities [Table]
Retained earnings
Entity Address, Address Line One
idt_IncreaseDecreaseInCustomerFundsDeposits
Customer fund deposits
Amount of change in the customer funds deposits.
Debt securities
City Area Code
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Payment, Tax Withholding, Share-Based Payment Arrangement
us-gaap_CapitalizedContractCostNetNoncurrent
Deferred customer contract acquisition costs included in "Other assets"
Local Phone Number
Revenue from Contract with Customer [Text Block]
Entity Address, Postal Zip Code
Equity Method Investment [Table]
idt_LongTermEquityInvestmentFairValueDisclosure
Equity investments in current assets
The fair value of the long term equity investments.
us-gaap_CapitalizedContractCostNetCurrent
Deferred customer contract acquisition costs included in "Other current assets"
idt_ReceivableWithImputedInterestMaximumLendingCapacity
Receivable With Imputed Interest, Maximum Lending Capacity
Maximum lending capacity for the receivable with imputed interest.
Cash and Cash Equivalents Disclosure [Text Block]
Title of 12(b) Security
Security Exchange Name
Capitalized Contract Cost [Table Text Block]
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
After five years to ten years
Trading Symbol
Capitalized Contract Cost [Table]
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
After ten years
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Within one year
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
After one year to five years
idt_OtherIncomeExpense
Other
Represents the other income (expense).
Class of Stock [Axis]
Fair Value
Total
Debt securities
us-gaap_CapitalizedContractCostAmortization
Amortization of deferred customer contract acquisition costs
Entity Common Stock, Shares Outstanding
Earnings Per Share [Text Block]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Other current assets
Other current assets
Change in unrealized loss on available-for-sale securities
us-gaap_CapitalizedContractCostNet
Total
us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to noncontrolling interests
Net income
Net income
Net income of the VIE
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Other Income and Other Expense Disclosure [Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Proceeds from maturities and sales of debt and equity securities
Proceeds from Sale, Maturity and Collection of Investments
Investment, Name [Axis]
Common stock, par value (in dollars per share)
us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Business Combination, Consideration Transferred, Equity Interest
Other income, net
Total other income, net
Foreign currency transaction adjustments
Other Long-Term Investments [Member]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Payments
us-gaap_Assets
Total assets
Cash and cash equivalents
Cash and cash equivalents
Geographical [Domain]
Geographical [Axis]
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common Stock, Capital Shares Reserved for Future Issuance (in shares)
Diluted (in dollars per share)
Investment [Text Block]
us-gaap_InvestmentOwnedBalanceShares
Investment Owned, Balance, Shares (in shares)
us-gaap_PaymentsToAcquireBusinessesGross
Payments to Acquire Businesses, Gross
Deferred revenue
Deferred revenue
Depreciation and amortization
Equity Method Investments [Table Text Block]
us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Shares withheld for employee taxes
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Investment Income [Table]
us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Less: comprehensive income attributable to noncontrolling interests
us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive income
us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total equity
Balance
Balance
Corporate Bond Securities [Member]
Business Combination [Text Block]
Noncontrolling Interest [Member]
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
us-gaap_StockholdersEquity
Total IDT Corporation stockholders' equity
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
us-gaap_PaymentsOfDividends
Payments of Dividends
Dividends paid
US Treasury Bill Securities [Member]
Stock, Class of Stock [Table]
Operating lease right-of-use assets
Other current liabilities
Other liabilities
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Revenues
Revenues
Commitments and contingencies