Document And Entity Information
Marketable Securities, Policy [Policy Text Block]
Note To Financial Statement Details Textual
Significant Accounting Policies
Investment Income, Net
Investment, Policy [Policy Text Block]
Note 1 - Description of Business and Summary of Significant Accounting Policies
us-gaap_IncomeTaxExpenseBenefit
(Provision for) benefit from income taxes
(PROVISION FOR) BENEFIT FROM INCOME TAXES
Hedge Funds [Member]
Note 3 - Business Segment Information
Note 4 - Revenue Recognition
Note 5 - Leases
Note 6 - Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents
Note 7 - Debt Securities
Note 8 - Equity Investments
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 9 - Fair Value Measurements
Note 10 - Property, Plant, and Equipment
Note 11 - Goodwill
Note 12 - Other Intangible Assets
us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Foreign currency transaction gains (losses)
Note 13 - Variable Interest Entity
Note 14 - Other Operating Expense, Net
Note 16 - Accrued Expenses
Note 17 - Redeemable Noncontrolling Interest
Note 18 - Other Income (Expense), Net
us-gaap_IncreaseDecreaseInAccountsReceivable
Increase (Decrease) in Accounts Receivable
Trade accounts receivable
Note 19 - Income Taxes
Note 21 - Stock-Based Compensation
Note 22 - Accumulated Other Comprehensive Loss
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Trade accounts payable, accrued expenses, settlement liabilities, other current liabilities, and other liabilities
Schedule of Investments [Table]
Note 1 - Description of Business and Summary of Significant Accounting Policies - Schedule of Calculation of Basic and Diluted Earnings (Details)
Note 1 - Description of Business and Summary of Significant Accounting Policies - Schedule of Changes in the Allowance for Credit Losses (Details)
Note 3 - Business Segment Information - Schedule of Business Segment Operations (Details)
Note 3 - Business Segment Information - Schedule of Geographic Information of Long-lived Assets (Details)
Note 4 - Revenue Recognition - Disaggregated Revenues by Segment (Details)
Note 4 - Revenue Recognition - Revenues by Geographic Region (Details)
Basis of Presentation and Significant Accounting Policies [Text Block]
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)
Note 4 - Revenue Recognition - Schedule of Contract Liability (Details)
Note 4 - Revenue Recognition - Deferred Customer Contract Acquisition Costs (Details)
Note 5 - Leases - Lease Costs (Details)
Note 5 - Leases - Aggregate Operating Lease Liability (Details)
Note 5 - Leases - Aggregate Operating Lease Liability (Details) (Parentheticals)
Note 5 - Leases - Schedule of Operating Lease Liability Maturity (Details)
Note 6 - Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents - Schedule of Cash, Cash Equivalents, and 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)
Note 9 - Fair Value Measurements - Schedule of Assets Measured (Details)
Note 9 - Fair Value Measurements - Schedule of Assets Measured (Details) (Parentheticals)
Note 9 - Fair Value Measurements - Schedule of Liabilities Measured (Details)
Note 9 - Fair Value Measurements - Schedule of Liabilities Measured (Details) (Parentheticals)
Note 10 - Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Details)
Note 11 - Goodwill - Schedule of Goodwill (Details)
Note 12 - Other Intangible Assets - Schedule of Amortized Intangible Assets (Details)
Note 13 - Variable Interest Entity - Schedule of Financial Statement Information (Details)
Note 14 - Other Operating Expense, Net - Schedule of Other Operating Expenses (Details)
Note 14 - Other Operating Expense, Net - Schedule of Other Operating Expenses (Details) (Parentheticals)
Note 16 - Accrued Expenses - Schedule of Accrued Expenses (Details)
Note 17 - Redeemable Noncontrolling Interest - Schedule of Noncontrolling Interest (Details)
Note 18 - Other Income (Expense), Net - Schedule of Other Income (Expenses) (Details)
Note 19 - Income Taxes - Schedule of Income Before Tax (Details)
us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Note 19 - Income Taxes - Schedule of Deferred Income Tax Assets (Details)
Note 19 - Income Taxes - Schedule of Components of Income Tax (Details)
us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Lessee, Operating Lease, Remaining Lease Term (Year)
Note 19 - Income Taxes - Schedule of Reconciliation of Income Tax (Details)
Note 19 - Income Taxes - Schedule of Reconciliation of Income Tax (Details) (Parentheticals)
Note 19 - Income Taxes - Cash Payments for Income Taxes (Details)
Note 19 - Income Taxes - Schedule of Change in Valuation Allowance (Details)
Leasehold Improvements [Member]
Note 21 - Stock-Based Compensation - Schedule of Valuation Assumptions of Stock Options (Details)
Note 21 - Stock-Based Compensation - Schedule of Option Activity (Details)
Note 21 - Stock-Based Compensation - Schedule of Stock Activity (Details)
Note 22 - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Segment Reporting [Text Block]
Segment Reporting [Table Text Block]
Preferred stock, $.01 par value; authorized shares—10,000; no shares issued
us-gaap_Liabilities
TOTAL LIABILITIES
Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block]
us-gaap_LiabilitiesAndStockholdersEquity
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS
Segment Reporting [Table]
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses, other current assets, and other assets
Zedge, Inc. [Member]
Represents Zedge, Inc.
Rafael Holdings, Inc. [Member]
Represents Rafael Holdings, Inc.
Selling, general and administrative (i)
Selling, general and administrative expense
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.
Lessee, Lease, Description [Table]
idt_RelatedPartySharesPurchased
Related Party Shares Purchased (in shares)
The number of related party shares that were purchased during the period.
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.
Lease Contractual Term [Axis]
idt_AmortizationOfEquityMethodInvestments
Amortization of equity method basis difference
Amount of amortization for the equity method investments.
Lease Contractual Term [Domain]
Changes in assets and liabilities:
idt_PercentOfOutstandingShares
Percent of Outstanding Shares
Represents the percent of outstanding stock.
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
NRS’ Class B Common Stock [Member]
Represents the NRS’ Class B common stock.
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
Aggregate funding provided by the Company, net
us-gaap_OtherExpenses
Other
Other
idt_CashIssuedWithCommonStock
Cash Issued With Common Stock
The amount of cash issued with the issuance of common stock.
us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)
idt_PercentOfOutstandingCapitalStock
Percent of Outstanding Capital Stock
The percent of outstanding capital stock.
US Government-sponsored Enterprises Debt Securities [Member]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of year
Cash, cash equivalents, and restricted cash and cash equivalents at end of year
idt_PercentOfOutstandingSharesDilutedBasis
Percent of Outstanding Shares, Diluted Basis
The percent of diluted outstanding shares.
idt_AccruedProceedsFromMilestone
Accrued Proceeds from Milestone
Represents the amount of accrued proceed form the milestone reached.
Operating cash flows from operating leases
us-gaap_OperatingLeasePayments
Rafael Holdings, Inc. Class B Common Stock [Member]
Represents the Rafael Holdings, Inc. (“Rafael”) Class B common stock.
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.
us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
us-gaap_MinorityInterestDecreaseFromRedemptions
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests
Line of Credit Facility, Lender [Domain]
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)
Non-vested restricted shares, outstanding (in shares)
Non-vested restricted shares, outstanding (in shares)
Lender Name [Axis]
Redeemable Noncontrolling Interest [Table Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Non-vested restricted shares, grant date fair value (in dollars per share)
Non-vested restricted shares, grant date fair value (in dollars per share)
Granted, shares (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
Granted, grant date fair value (in dollars per share)
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)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited, shares (in shares)
us-gaap_LineOfCredit
Long-Term Line of Credit
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Share-Based Payment Arrangement, Plan Modification, Incremental Cost
us-gaap_LegalFees
Legal Fees
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Line of Credit [Member]
Vested, grant date fair value (in dollars per share)
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested, shares (in shares)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive
2031
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive
Thereafter
Weighted-average discount rate-operating leases
Weighted-average grant date fair value (in dollars per share)
Cancelled / Forfeited, options (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
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
EXERCISABLE, options (in shares)
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
EXERCISABLE, weighted average exercise price (in dollars per share)
Measurement Frequency [Axis]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding, options (in shares)
Outstanding, options (in shares)
Commitments and Contingencies Disclosure [Text Block]
Nature of Expense [Axis]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
Fair Value Hierarchy and NAV [Axis]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Outstanding, intrinsic value
Outstanding, intrinsic value
Common stock, issued (in shares)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Common stock, outstanding (in shares)
Award Type [Domain]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Average risk-free interest rate
Common stock, authorized (in shares)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Expected volatility
Common Class B [Member]
Expected dividend yield
Schedule of Accrued Liabilities [Table Text Block]
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]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Common stock
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Current:
Deferred:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_TableTextBlock
Notes Tables
Comprehensive Income (Loss) Note [Text Block]
Computer Equipment [Member]
us-gaap_ComprehensiveIncomeNetOfTax
COMPREHENSIVE INCOME ATTRIBUTABLE TO IDT CORPORATION
Concentration Risk Type [Axis]
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”
Accounts Receivable [Member]
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]
Concentration Risk Type [Domain]
Other intangibles, net
Other intangibles, net
Goodwill [Text Block]
Amortized Cost
Income Tax Jurisdiction, Domestic State and Local [Member]
us-gaap_LongTermInvestments
Noncurrent equity investments
Statement of Stockholders' Equity [Abstract]
Stock Conversion Description [Axis]
Loss Contingency Nature [Axis]
Statement of Comprehensive Income [Abstract]
us-gaap_EquitySecuritiesFVNINoncurrent
Equity investments, noncurrent
us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Equity Securities, FV-NI
Conversion of Stock, Name [Domain]
Statement of Cash Flows [Abstract]
UNITED KINGDOM
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Tax Authority of Ireland [Member]
Tax Authority of Ireland
Other Foreign Tax Authorities [Member]
Other Foreign Tax Authorities
Equity Components [Axis]
IDT Services Malta [Member]
IDT Services Malta
Tax Authority of Peru [Member]
Tax Authority of Peru
Share-Based Payment Arrangement [Policy Text Block]
Cancellation of debt exclusion, rate
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the cancellation of debt exclusions.
Equity Component [Domain]
Offsetting Liabilities [Table]
Tax Authorities in South America [Member]
Tax Authorities in South America
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
idt_EffectiveIncomeTaxRateReconciliationCancellationOfDebtExclusionAmount
Cancellation of debt exclusion, amount
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the cancellation of debt exclusions.
Tennessee Tax Authority [Member]
Tennessee Tax Authority
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Equity [Text Block]
Other State Tax Authorities [Member]
Other State Tax Authorities
AOCI Attributable to Parent [Member]
Schedule of Income Taxes Paid [Table Text Block]
Tabular disclosure of income taxes paid.
Additional Paid-in Capital [Member]
Wisconsin Tax Authority [Member]
Wisconsin Tax Authority
Retained Earnings [Member]
Loss Contingency, Nature [Domain]
idt_PropertyPlantAndEquipmentIncludingAdditionalLonglivedAssets
July 31, 2026
Amount, after accumulated depreciation, depletion, and amortization, of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection. Includes additional long-lived assets, such as capitalized internal software.
idt_AdjustmentsToAdditionalPaidInCapitalDistributionToNoncontrollingInterest
Distributions to noncontrolling interests
Amount of decrease in additional paid in capital (APIC) resulting from distribution to noncontrolling interest.
Settlement assets, net of reserve of $1,535 and $1,367 at July 31, 2026 and 2025, respectively
Settlement liabilities
Subsequent Event Type [Domain]
Subsequent Event Type [Axis]
Other Operating Income and Expense [Text Block]
Cost of Goods and Service [Policy Text Block]
Direct cost of revenues
Direct cost of revenues
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Share-Based Payment Arrangement, Option [Member]
Summary of Valuation Allowance [Table Text Block]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Liabilities, Current [Abstract]
us-gaap_CurrentIncomeTaxExpenseBenefit
Current Income Tax Expense (Benefit)
us-gaap_LiabilitiesCurrent
TOTAL CURRENT LIABILITIES
us-gaap_CurrentFederalTaxExpenseBenefit
Federal
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State and local
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block]
Customer Concentration Risk [Member]
us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi
Proceeds from Sale of Equity Securities, FV-NI
Lease, Cost [Table Text Block]
Severance
Customer Relationships [Member]
Revenue Benchmark [Member]
Lessee, Leases [Policy Text Block]
Other Commitments [Table]
Shareholders' Equity and Share-Based Payments [Text Block]
us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Debt Disclosure [Text Block]
Other Operating Income (Expense), Net
Other operating expense, net
Noncontrolling interests
Noncontrolling interests
Use of Estimates, Policy [Policy Text Block]
Customer funds 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
Lessee, Operating Leases [Text Block]
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Stock-based compensation
us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Distributions to noncontrolling interests
us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Subsidiary, Ownership Percentage, Noncontrolling Owner
UNITED STATES
us-gaap_MinorityInterestOwnershipPercentageByParent
Subsidiary, Ownership Percentage, Parent
Business acquisition holdback payment
Stock Issued During Period, Value, Acquisitions
Noncontrolling Interest [Table]
CURRENT ASSETS:
Exercise of stock options
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]
Trade Names [Member]
us-gaap_StockIssuedDuringPeriodSharesNewIssues
Stock Issued During Period, Shares, New Issues (in shares)
Business acquisition holdback payment (in shares)
Stock Issued During Period, Shares, Acquisitions (in shares)
Exercise of stock options (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)
Exercised, options (in shares)
Related and Nonrelated Parties [Axis]
us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Shares, Acquired (in shares)
Net income for the year ended July 31, 2025
Net income for the year ended July 31, 2024
Schedule of Long-Term Debt Instruments [Table]
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
Commitments and Contingencies, Policy [Policy Text Block]
Accounting Policies [Abstract]
US Treasury Securities [Member]
Segments [Axis]
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits
us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit)
us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Share Repurchase Program, Remaining Authorized, Number of Shares (in shares)
us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Unrecognized Tax Benefits, Period Increase (Decrease)
us-gaap_NetIncomeLoss
NET INCOME ATTRIBUTABLE TO IDT CORPORATION
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs
us-gaap_OtherNoncashIncomeExpense
Other
us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Charitable contributions
us-gaap_ConversionOfStockSharesConverted1
Conversion of Stock, Shares Converted (in shares)
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State and local
Accumulated Other Comprehensive Income (Loss) [Table]
us-gaap_ConversionOfStockSharesIssued1
Conversion of Stock, Shares Issued (in shares)
Value of the Company's Class B Common stock/DSUs exchanged for NRS shares
Conversion of Stock, Amount Issued
us-gaap_DeferredTaxAssetsGross
Total deferred income tax assets
us-gaap_BusinessCombinationContingentConsiderationLiability
TOTAL
TOTAL
us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Net operating loss
Accounting Standards Update and Change in Accounting Principle [Table]
us-gaap_DeferredTaxAssetsNet
NET DEFERRED INCOME TAX ASSETS
Disbursement prefunding
Disbursement prefunding
The amount of disbursement prefunding recognized.
NON-CASH INVESTING AND FINANCING ACTIVITIES
Settlement asset reserve
The reserve amount for the settlement assests.
idt_AdjustmentsToAdditionalPaidInCapitalExchangeOfStock
Adjustments to Additional Paid in Capital, Exchange of Stock
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 Class B common stock through repurchase program
Repurchases of Class B common stock through repurchase program
Repurchase Program [Member]
Represents the repurchase program.
National Retail Solutions [Member]
Represents National Retail Solutions.
us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Accrued expenses
Net2phone 2.0 [Member]
Represents net2phone 2.0.
us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Bad debt reserve
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Stock-based compensation
Traditional Communications [Member]
Represents the Traditional Communications segment.
Fintech [Member]
Represents the fintech segment.
idt_FullyDilutedMinorityInterestOwnershipPercentageParent
Fully Diluted Minority Interest Ownership, Percentage, Parent
Fully diluted interest in net assets of the subsidiary, expressed as a percentage.
Other [Member]
Represents the other options.
us-gaap_OpenTaxYear
Open Tax Year
BOSS Money [Member]
Represents BOSS money.
us-gaap_ValuationAllowancesAndReservesDeductions
Valuation allowance, deductions
Deductions
Vesting [Axis]
BOSS Revolution [Member]
Represents the BOSS Revolution.
us-gaap_ValuationAllowancesAndReservesBalance
Balance at beginning of year
Balance at end of year
Vesting [Domain]
IDT Digital Payments [Member]
Represents the IDT Digital Payments.
us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowance
Additional charged to costs and expenses
Valuation allowance, additions
Net2phone [Member]
Represents the net2phone segment.
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Schedule of Variable Interest Entities [Table Text Block]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
IDT Global [Member]
Represents the IDT Global.
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Noncompete Agreements [Member]
us-gaap_DividendsCommonStock
Dividends declared
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Table]
Aggerate Operating Lease Liability [Table Text Block]
The tabular disclosure presenting the aggregate operating lease liability.
Disbursement Payments VIE [Member]
Represents the Disbursement Payments VIE.
IDT Financial Services Gibraltar [Member]
Represents IDT Financial Services (Gibraltar).
us-gaap_SharesIssued
BALANCE (in shares)
BALANCE (in shares)
Document Type
Restricted net2phone and NRS common stock purchased from employees
Amount of increase (decrease) to additional paid in capital (APIC) resulting from the common stock purchased from employees.
Document Information [Line Items]
us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Cost
Document Annual Report
Weighted-average remaining lease term-operating leases (Year)
Document Information [Table]
Period (Year)
Computer Software [Member]
Represents computer software.
Entity Interactive Data Current
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
Document Transition Report
Diluted (in shares)
Diluted weighted-average number of shares (in shares)
Document Financial Statement Error Correction [Flag]
Liabilities incurred for acquisition
Carrier minutes termination
The amount of accrued carrier minutes termination.
Basic weighted-average number of shares (in shares)
Basic (in shares)
Mason and Company Consulting [Member]
Mason and Company Consulting
Conversion of NRS Shares into IDT Class B Common Stock [Member]
Conversion of NRS Shares into IDT Class B Common Stock.
idt_NumberOfLargestCustomers
Number of Largest Customers
Represents number of largest customers.
Shares of the Company’s Class B common stock issued to certain executive officers for bonus payments
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage
Jonas Media Group [Member]
Jonas Media Group
Genie Energy [Member]
Genie Energy
CTM Media Group [Member]
CTM Media Group
Maintenance and support
The amount of accrued maintenance and support.
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]
Lawsuit with JDS1 [Member]
Lawsuit with JDS1
Five Largest Customer [Member]
Represents Five Largest Customer
idt_OperatingLeaseAnnualRent
Operating Lease, Annual Rent
The annual rent of the operating lease.
Income Tax Jurisdiction [Axis]
ICFR Auditor Attestation Flag
Document Fiscal Period Focus
Customer [Domain]
Document Fiscal Year Focus
Investment, Name [Domain]
us-gaap_DepreciationAndAmortization
Depreciation and amortization
Amendment Flag
Equity Securities without Readily Determinable Fair Value [Table]
Common Stock [Member]
Deferred Stock Units (DSUs) [Member]
Deferred Stock Units (DSUs)
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).
Document Period End Date
Property, Plant, and Equipment [Text Block]
idt_StockIssuedDuringPeriodPercentOfOutstandingShares
Stock Issued During Period, Percent of Outstanding Shares
The number of shares issued, as a percent of total outstanding shares.
Long-Lived Asset, Class [Domain]
Granted, options (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)
Legal Entity [Axis]
idt_SharebasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesRepurchased
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Shares Repurchased
The percentage of outstanding shares repurchased.
Conversion of NRS Shares into Class B Common Stock [Member]
Represents Conversion of NRS Shares into Class B Common Stock.
Executive Officers and Other Employees [Member]
Executive Officers and Other Employees
Entity File Number
Entity Tax Identification Number
Other Tax Authorities [Member]
Other Tax Authorities
Entity [Domain]
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Debt securities, unrealized loss 12 months or longer
Entity Central Index Key
idt_OperatingLossCarryforwardsNotSubjectToExpiration
Operating Loss Carryforwards, Not Subject to Expiration
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that is not subject to expiration.
Entity Registrant Name
us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Equity Securities without Readily Determinable Fair Value, Amount
Balance
BALANCE, END OF PERIOD
idt_OperatingLossCarryforwardsSubjectToExpiration
Operating Loss Carryforwards, Subject to Expiration
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, subject to expiration.
Entity Well-known Seasoned Issuer
Software, Internally Developed [Member]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Entity Current Reporting Status
idt_EffectiveIncomeTaxRateReconciliationRevaluationOfExistingForeignAttributesAmount
Revaluation of existing foreign attributes, amount
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the revaluation of existing foreign attributes.
Entity Voluntary Filers
us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Debt Securities, Available-for-Sale, Realized Gain (Loss)
idt_OtherSegmentItems
Other segment items
Amount of other segment items.
Entity Incorporation, State or Country Code
idt_DeferredTaxAssetsUnrealizedGain
Unrealized gains
Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as unrealized gain.
Current Fiscal Year End Date
Entity Public Float
Redemption for Visa Series C Preferred mandatory release assessment
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 expense
Entity Filer Category
idt_GainOnContingentConsiderationLiabilityWriteoff
Gain on Contingent Consideration Liability Writeoff
The gain on the writeoff of contingent consideration liablities.
Entity Shell Company
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Business Combination, Recognized Liability Assumed, Liability
Entity Emerging Growth Company
Entity Small Business
us-gaap_OperatingIncomeLoss
Income from operations
Income (loss) from operations
Cash and Cash Equivalents [Domain]
Long-Lived Asset, Held and Used, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_EffectiveIncomeTaxRateReconciliationGiltiPercent
Global intangible low-taxed income, net of foreign tax credit, rate
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred
Entity Address, State or Province
Entity Address, City or Town
Marketable Securities [Table]
Entity Address, Address Line One
idt_IncreaseDecreaseInCustomerFundsDeposits
Customer funds deposits
Amount of change in the customer funds deposits.
Debt securities
City Area Code
us-gaap_CapitalizedContractCostNetNoncurrent
Deferred customer contract acquisition costs included in “Other assets”
Local Phone Number
Maintenance Cost, Policy [Policy Text Block]
Entity Address, Postal Zip Code
idt_LongTermEquityInvestmentFairValueDisclosure
Equity investments included 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.
Preferred Stock [Member]
us-gaap_EffectiveIncomeTaxRateReconciliationGiltiAmount
Global intangible low-taxed income, net of foreign tax credit, amount
Cash and Cash Equivalents Disclosure [Text Block]
Title of 12(b) Security
Security Exchange Name
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
After five years through ten years
Trading Symbol
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
After ten years
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Within one year
us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
After one year through five years
us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value
idt_OtherIncomeExpense
Other
Represents the other income (expense).
Fair Value
TOTAL
Debt securities
Entity Common Stock, Shares Outstanding
Chief Operating Officer [Member]
Other current assets
Other current assets
Chief Executive Officer [Member]
Change in unrealized loss on available-for-sale securities
us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to noncontrolling interests
Net income
NET INCOME
Net income of the Disbursement Payments VIE
Other Income and Other Expense Disclosure [Text Block]
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
EXERCISABLE, intrinsic value
Investment, Name [Axis]
us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Business Combination, Consideration Transferred, Equity Interest
Other Nonoperating Income (Expense)
TOTAL
Other Long-Term Investments [Member]
us-gaap_Assets
TOTAL ASSETS
Auditor Firm ID
Auditor Name
Geographical [Domain]
Auditor Location
Geographical [Axis]
us-gaap_NotesAndLoansReceivableNetCurrent
Financing Receivable, after Allowance for Credit Loss, Current
Diluted (in dollars per share)
Customer [Axis]
Depreciation and amortization
Intangible Asset [Text Block]
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Consolidation, Policy [Policy Text Block]
Investment Income [Table]
us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Less: comprehensive income attributable to noncontrolling interests
Intangible Asset, Finite-Lived [Table Text Block]
Intangible Asset, Finite-Lived [Table]
us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME
us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL EQUITY
Balance
Balance
Business Combination [Text Block]
Noncontrolling Interest [Member]
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
Forfeited, grant date fair value (in dollars per share)
Award Timing MNPI Disclosure [Text Block]
ecd_AwardTmgMnpiCnsdrdFlag
Award Timing MNPI Considered [Flag]
us-gaap_PaymentsOfDividends
Payments of Dividends
Dividends paid
Stock, Class of Stock [Table]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
us-gaap_PaymentsForLegalSettlements
Payments for Legal Settlements
Other Liabilities, Current
Other liabilities
Other long-term liabilities
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Commitments and contingencies
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]
srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Share Repurchase Program, Authorized, Number of Shares (in shares)
idt_IncreaseDecreaseInSettlementAssetsAndDisbursementPrefunding
Increase (Decrease) in Settlement Assets and Disbursement Prefunding
Amount of change in settlement assets and disbursement funding during the period.
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
us-gaap_RestrictedCashAndCashEquivalents
Restricted cash and cash equivalents
Trading Arrangements, by Individual [Table]
Material Terms of Trading Arrangement [Text Block]
Retirement Benefits [Text Block]
ecd_InsiderTrdPoliciesProcAdoptedFlag
Insider Trading Policies and Procedures Adopted [Flag]
Financial Instrument [Axis]
Minimum [Member]
Product and Service, Other [Member]
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Losses
Gross Unrealized Gains
Insider Trading Policies and Procedures [Line Items]
Statistical Measurement [Domain]
Oncore Digital Inc [Member]
Represents the Oncore Digital Inc acquisition.
Maximum [Member]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Foreign
Share Repurchase Program [Axis]
Equity in the net loss of investee
Equity in net loss of investee
Share Repurchase Program [Domain]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Domestic
Valuation allowance, rate
us-gaap_EffectiveIncomeTaxRateContinuingOperations
PROVISION FOR INCOME TAXES, rate
Debt Securities, Available-for-Sale [Table]
us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
U.S. federal income tax at statutory rate, percent
Cancelled / Forfeited, weighted average exercise price (in dollars per share)
Statutory tax rate difference, rate
Granted, weighted average exercise price (in dollars per share)
Exercised, weighted average exercise price (in dollars per share)
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.
Income Tax Jurisdiction [Domain]
Financial Instruments [Domain]
Dividends declared per share (in dollars per share)
Common Stock, Dividends, Per Share, Declared (in dollars per share)
Nondeductible impairment charge, rate
Non Vested Restricted Common Stock [Member]
Represents non-vested restricted common stock.
us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State and local income tax, net of federal income tax benefit
Other, rate
Upward adjustment
Dividends [Axis]
Dividends [Domain]
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Debt securities, fair value 12 months or longer
Impairments
Award Type [Axis]
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 provided by operating activities:
Plan Name [Axis]
Plan Name [Domain]
Defined Benefit Plan [Table]
(i) Stock-based compensation included in total operating expenses
Share-Based Payment Arrangement, Expense
Consolidation Items [Axis]
Cash and Cash Equivalent [Table]
Title and Position [Axis]
Certain Executive Officers [Member]
Represents certain executive officers.
Stock-based compensation expense
Subsequent Event [Member]
Consolidation Items [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum
Preferred stock, issued (in shares)
Amortization period (Year)
Intangible Asset, Finite-Lived, Useful Life (Year)
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_BusinessCombinationContingentConsiderationLiabilityCurrent
Other current liabilities
us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Other noncurrent liabilities
Other noncurrent liabilities
New Accounting Pronouncements, Policy [Policy Text Block]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Share-Based Payment Arrangement, Tranche One [Member]
Statement [Table]
Reclassification, Comparability Adjustment [Policy Text Block]
Credit Facility [Axis]
Credit Facility [Domain]
Deferred Stock Units, Certain Qualified Holders [Member]
Represents Deferred Stock Units of certain qualified holders.
idt_PaymentsToAcquireNotesReceivableFromEquityMethodInvestment
Notes receivable from equity method investment
The amount of payments to acquire notes receivable from equity method investment.
Revolving Credit Facility [Member]
Net2phone 2.0 and National Retail Solutions Common Stock [Member]
Represents the Net2phone 2.0 and National Retail Solutions common stock.
Income Tax Authority, Name [Axis]
Income Tax Authority, Name [Domain]
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.
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_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_DeferredTaxAssetsPropertyPlantAndEquipment
Depreciation
Equipment [Member]
Equity investments
Equity investments, current
Tax Authority, Spain [Member]
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
Certain Employees [Member]
Represents certain employees.
Tax and Customs Administration, Netherlands [Member]
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.
Less: net (loss) gains recognized during the period on equity investments sold during the period
Stock issued/to be issued to an executive officer for bonus payment
Net gains recognized during the period on equity investments
Stock issued/to be issued to an executive officer for bonus payment (in shares)
Product and Service [Domain]
Product and Service [Axis]
Ownership [Axis]
Ownership [Domain]
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant, and Equipment, Useful Life (Year)
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Unrealized gains recognized during the period on equity investments still held at the reporting date
His Majesty's Revenue and Customs (HMRC) [Member]
Statement [Line Items]
Grantee Status [Domain]
Share-Based Payment Arrangement, Employee [Member]
Grantee Status [Axis]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
Trade accounts payable
Trade accounts payable
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five
Proceeds from borrowings under revolving credit facility
Regulatory fees and taxes
Legal and professional fees
Proceeds from borrowings
us-gaap_SegmentExpenditureAdditionToLongLivedAssets
Capital expenditures
Accrued expenses
Accrued expenses
TOTAL
Nonrelated Party [Member]
Related Party [Member]
Compensation costs
Commissions
Outstanding, remaining term (Year)
us-gaap_OtherAccruedLiabilitiesCurrent
Other
Expected term (years) (Year)
EXERCISABLE, remaining term (Year)
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Balance, beginning of period
BALANCE, END OF PERIOD
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Other comprehensive income (loss):
Income Tax Jurisdiction, Domestic Federal [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
idt_PolicyTable
Interest expense included in “Interest income, net”
“Other operating expense, net”
us-gaap_ProceedsFromFeesReceived
Proceeds from Fees Received
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
“Foreign currency translation adjustments”
Intangible Asset, Finite-Lived, Class [Axis]
Intangible Asset, Finite-Lived, Class [Domain]
Proceeds from exercise of stock options
Proceeds from Stock Options Exercised
idt_DefinedBenefitPlansMatchingContributionVestingPeriod
Defined Benefit Plans, Matching Contribution Vesting Period (Year)
The vesting period for the matching contribution in the defined benefit plan.
idt_PerformanceBondsOutstanding
Performance Bonds Outstanding
Amount related to the performance bonds.
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 1 [Member]
Income Tax Jurisdiction, Foreign [Member]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Property, plant, and equipment, net
Property, plant, and equipment, net
Property, plant, and equipment, net
Property, plant, and equipment, gross
Class A and Class B Common Stock [Member]
Represents the Class A and Class B common stock.
Deferred income tax assets, net
Property, Plant, and Equipment [Policy Text Block]
Provision for credit losses and reserve for settlement assets
Furniture and Fixtures [Member]
EQUITY:
Fair Value Option, Disclosures [Table]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Fair Value Disclosures [Text Block]
us-gaap_GainLossOnInvestments
Gains on investments
Trade accounts receivable, net of allowance for credit losses of $6,938 and $9,097 at July 31, 2026 and 2025, respectively
Accounts Receivable, after Allowance for Credit Loss, Current
Purchase of convertible preferred stock
Purchase of convertible preferred stock in equity method investment
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less accumulated depreciation and amortization
us-gaap_PaymentsToAcquireInvestments
Purchases of debt securities and equity investments
Accumulated other comprehensive loss
Accumulated other comprehensive income
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-lived intangible asset, amortization
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Payments for acquisition
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income taxes
Additional paid-in capital
Exchange of NRS shares for IDT Class B common stock
Amount of Stock issued during period in exchange of stocks from noncontrolling interest.
us-gaap_AdjustmentForAmortization
Amortization
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Exchange of NRS shares for IDT Class B common stock (in shares)
The number of stock issued during period in exchange of stocks from noncontrolling interest.
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures
Internal Use Software [Member]
Represents internal use software.
Non-US [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]
Schedule of Valuation and Qualifying Accounts [Table Text Block]
Table disclosure of valuation and qualifying accounts.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Settlement Assets and Settlement Liabilities [Policy Text Block]
The policy disclosure of settlement assets and settlement liabilities.
Disbursement Prefunding [Policy Text Block]
The policy disclosure of disbursement prefunding.
us-gaap_GrossProfit
GROSS PROFIT
Reserve for Losses on Settlement Assets [Member]
Represents reserve for losses on settlement assets.
Goodwill [Table]
Credit Loss, Financial Instrument [Policy Text Block]
Straight Path Communications Class Action [Member]
Represents Straight Path Communications Class Action.
us-gaap_Depreciation
Depreciation
Class of Stock [Domain]
idt_ValuationAllowanceDeferredTaxAssetChangeDueToUtilizationOrDisposalOfPreviouslyValuedDeferredIncomeTaxAssets
Valuation Allowance, Deferred Tax Asset Change Due to Utilization or Disposal of Previously Valued Deferred Income Tax Assets
Amount of valuation allowance on deferred tax asset change due to utilization or disposal of previously valued deferred income tax assets.
idt_ValuationAllowanceDeferredTaxAssetChangeForProfitability
Valuation Allowance, Deferred Tax Asset, Change for Profitability
Amount of valuation allowance on deferred tax asset, change for profitability.
idt_ValuationAllowanceDeferredTaxAssetNotAbleToUtilized
Valuation Allowance Deferred Tax Asset Not Able to Utilized
Amount of valuation allowance deferred tax asset not able to utilized.
NRS DSU [Member]
Represents NRS DSU.
idt_InvestmentSharesAcquired
Investment Shares, Acquired (in shares)
Number of acquired investment shares.
Redeemable Noncontrolling Interest [Table]
Redeemable noncontrolling interest
idt_InvestmentsAdditionalSharesAbleToPurchase
Investments, Additional Shares Able to Purchase (in shares)
Number of additional shares able to purchase.
idt_InvestmentsAdditionalSharesAcquired
Investments Additional Shares, Acquired (in shares)
Number of additional shares acquired.
us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Long-Lived Asset, Held and Used, Impairment Loss
Write-off of equipment
Advertising Cost [Policy Text Block]
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Howard and Shmuel Jonas [Member]
Represents Howard and Shmuel Jonas.
Class B Common Stock [Member]
Represents Class B Common Stock.
Name of Receivable with Imputed Interest [Domain]
Lease in Bronx, New York [Member]
Represents lease in Bronx, New York.
us-gaap_AdvertisingExpense
Advertising Expense
us-gaap_ReceivablesNetCurrent
Receivables, Net, Current
Operating Segments [Member]
Segments [Domain]
us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Intangible Asset, Excluding Goodwill, Impairment Loss
Impairment Loss
us-gaap_UndistributedEarningsOfForeignSubsidiaries
Undistributed Earnings of Foreign Subsidiaries
Allowance for credit losses
Schedule of Receivables with Imputed Interest, Name of Receivable with Imputed Interest [Axis]
Equity Investment, Policy [Policy Text Block]
Disclosure of accounting policy for equity investment.
Corporate Segment [Member]
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_NumberOfOperatingSegments
Number of Operating Segments
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
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 5,305 and 4,872 shares of Class B common stock at July 31, 2026 and 2025, respectively
Treasury stock, common shares (in shares)
Treasury Stock, Common [Member]
us-gaap_AmortizationOfIntangibleAssets
Intangible Asset, Finite-Lived, Amortization Expense
Common Class A [Member]
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Foreign currency translation adjustments
us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Income Tax Disclosure [Text Block]
Restricted Stock [Member]
Income Tax, Policy [Policy Text Block]
Visa Series C Preferred Stock [Member]
Represents the Visa series C preferred stock.
us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Statutory tax rate difference, amount
us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
U.S. federal income tax at statutory rate, amount
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.
Equity Method Investee Revolving Credit Agreement [Member]
The revolving credit agreement with the equity method investee.
us-gaap_RelatedPartyTransactionAmountsOfTransaction
Related Party Transaction, Amounts of Transaction
Related and Nonrelated Parties [Domain]
Intangible Asset, Excluding Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]
Visa Series A Common Stock [Member]
Represents the Visa series A common stock.
us-gaap_IncomeTaxReconciliationNondeductibleExpense
Nondeductible expenses, amount
Related Party Transaction [Table]
Related Party Transactions Disclosure [Text Block]
us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Nondeductible impairment charge, amount
us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State and local income tax, net of federal income tax benefit, amount
Prior year benefit, amount
us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount
us-gaap_IncomeTaxReconciliationOtherAdjustments
Other, amount
Other, amount
Fair Value Hierarchy and NAV [Domain]
Measurement Frequency [Domain]
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
Statement of Financial Position [Abstract]
us-gaap_AssetsDisposedOfByMethodOtherThanSaleInPeriodOfDispositionGainLossOnDisposition1
Long-Lived Asset, Disposed of Other than by Sale, Gain (Loss) from Disposal
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Total (losses) gains included in “Other expense, net”
Cash payments made for income taxes
INCOME TAXES, NET OF AMOUNTS REFUNDED
us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Repayments of borrowings
Mutual Fund [Member]
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
Payments to Noncontrolling Interests
Distributions to noncontrolling interests
Other assets
Other non-current assets
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchase of Common Stock
NRS [Member]
Represents NRS.
OPERATING EXPENSES:
us-gaap_ConcentrationRiskPercentage1
Concentration Risk, Percentage
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
us-gaap_IncomeTaxPaidForeignAfterRefundReceived
Foreign
us-gaap_OperatingExpenses
TOTAL OPERATING EXPENSES
Earnings per share attributable to IDT Corporation common stockholders:
Stock options (in shares)
us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Basic (in dollars per share)
Antidilutive Security, Excluded EPS Calculation [Table]
Effective Income Tax Rate Reconciliation [Table]
us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived
State and local
Tax Jurisdiction of Domicile [Extensible Enumeration]
Earnings Per Share, Policy [Policy Text Block]
us-gaap_IncomeTaxPaidFederalAfterRefundReceived
Federal
us-gaap_InsuranceCommissions
Straight Path Communications Inc. class action insurance claims
Restrictions on Cash and Cash Equivalents [Table Text Block]
Finite-lived intangible asset, net
Intangible Asset, Finite-Lived, after Accumulated Amortization
Finite-lived intangible asset, gross
Restrictions on Cash and Cash Equivalents [Table]
Restricted cash and cash equivalents
Restricted cash
Restricted Cash and Cash Equivalents [Axis]
us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period
us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Change in unrealized gains or losses for the period included in earnings for liabilities at the end of the period
Goodwill
Balance
Balance
Investment [Table Text Block]
Operating lease cost
us-gaap_OperatingLeaseCost
Short-term lease cost
us-gaap_ShortTermLeaseCost
Financing Receivable, Allowance for Credit Loss [Table]
us-gaap_LeaseCost
TOTAL LEASE COST
Business Combination [Domain]
us-gaap_RevenueRemainingPerformanceObligation
Total
Business Combination [Axis]
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue [Table]
Vendor and Customer Relationship [Member]
The vendor and customer relationship.
Business Combination [Table]
Reclassified From Settlement Assets, Disbursement Prefunding, Prepaid Expenses, Other Current Assets, and Other Assets [Member]
Amount of reclassified from Settlement assets, disbursement prefunding, prepaid expenses, other current assets, and other assets
The 2025 Equity Growth Program [Member]
Relating to the 2025 Equity Growth Program.
The 2022 Equity Growth Program [Member]
Relating to the 2022 Equity Growth Program.
Fair Value Measurement, Policy [Policy Text Block]
us-gaap_EquityMethodInvestmentAggregateCost
Equity Method Investment, Aggregate Cost
Other comprehensive income (loss) attributable to IDT Corporation
Other comprehensive income (loss)
Deferred Stock Units [Member]
Represents the deferred stock units.
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
Retained earnings
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Payment, Tax Withholding, Share-Based Payment Arrangement
Shares of the Company’s Class B common stock issued for business acquisitions
The value of the stock issued for acquisitions.
Revenue from Contract with Customer [Text Block]
Equity Method Investment [Table]
Equipments [Member]
Represents the equipment.
Capitalized Contract Cost [Table Text Block]
Capitalized Contract Cost [Table]
Class of Stock [Axis]
Revenue [Policy Text Block]
us-gaap_CapitalizedContractCostAmortization
Capitalized Contract Cost, Amortization
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
us-gaap_CapitalizedContractCostNet
TOTAL
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Deferred income taxes
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Redemption for Visa mandatory release assessment
Proceeds from maturities and sales of debt securities and equity securities
Proceeds from Sale, Maturity and Collection of Investments
Property, Plant, and Equipment [Table]
Common stock, par value (in dollars per share)
NRS and Zedge [Member]
Represents NRS and Zedge transactions.
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Foreign currency translation adjustments
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Payments
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Long-Lived Asset, Class [Axis]
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and cash equivalents
Cash and cash equivalents
Impaired Long-Lived Assets Held and Used by Type [Axis]
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common Stock, Capital Shares Reserved for Future Issuance (in shares)
Investment [Text Block]
us-gaap_InvestmentOwnedBalanceShares
Investment Owned, Balance, Shares (in shares)
us-gaap_PaymentsToAcquireBusinessesGross
Payments to Acquire Businesses, Gross
Deferred revenue
Deferred revenue
Equity Method Investments [Table Text Block]
us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
Shares withheld for employee taxes
Shares withheld for employee taxes
Tax credits, amount
Amount of tax credit in the reconciliation.
O 2026 Q2 Dividends [Member]
Represents O 2026 Q2 Dividends.
Software, Internal-Use [Policy Text Block]
O 2026 Q3 Dividends [Member]
Represents O 2026 Q3 Dividends.
O 2025 Q1 Dividends [Member]
Represents O 2025 Q1 Dividends.
Interest Expenses [Member]
Represents interest expenses.
Cash payments made for interest
O 2024 Q1 Dividends [Member]
Represents O 2024 Q1 Dividends.
idt_ContingentConsiderationLiabilityWriteOff
Write-off of contingent consideration
The amount of write-off for the contingent consideration liability.
Other Operating Expense, Net [Member]
Represents other operating expense, net.
Interim Period, Costs Not Allocable [Domain]
idt_EffectiveIncomeTaxRateReconciliationTaxCreditPercent1
Tax credits, rate
Corporate Bond Securities [Member]
us-gaap_StockholdersEquity
Total IDT Corporation stockholders’ equity
Goodwill [Table Text Block]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities
Payment for Contingent Consideration Liability, Financing Activities
US Treasury Bill Securities [Member]
Operating lease right-of-use assets
Property, Plant, and Equipment [Table Text Block]
REVENUES
Revenues
Inventory, Policy [Policy Text Block]
us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Valuation allowance, amount