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Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 | Jan. 31, 2015 | Nov. 30, 2014 | Jun. 30, 2015 | Mar. 11, 2015
Equity (Textual) |  |  |  |  |
Dividends paid | $ 43.2 us-gaap_DividendsCommonStockCash |  |  |  |
Common stock dividends declared | $ 1.85 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |
Shares contributed cost by company | 1.3 us-gaap_DefinedContributionPlanCostRecognized |  |  |  |
Board of Directors [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Common stock dividends declared |  | $ 0.64 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_TitleOfIndividualAxis = us-gaap_BoardOfDirectorsChairmanMember | $ 0.68 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_TitleOfIndividualAxis = us-gaap_BoardOfDirectorsChairmanMember |  |
Class A common stock [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Dividends paid |  |  |  |  |
Class A common stock [Member] | Subsequent Event [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Dividend per share declared |  |  |  | $ 0.18 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Date of declared dividend to be paid |  |  |  | Jun. 23, 2015 |
Record date of declared dividend |  |  |  | Jun. 15, 2015 |
Class B common stock [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Dividends paid |  |  |  |  |
Shares contributed cost by company | 70,843 idt_DefinedContributionPlanEmployerMatchingContributionInEmployerShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Class B common stock shares repurchased | 29,675 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Aggregate purchase price of shares repurchased | 0.4 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Stock repurchase program, remaining number of shares authorized to be repurchased | 5,000,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  | The shares vest 50% in January 2017 and 50% in July 2018.
Unrecognized compensation expense related to restricted shares |  |  |  |  | $ 5.0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Class B common stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Stock repurchase program, shares authorized for repurchase | 8,300,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = idt_StockRepurchaseProgramMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Class B common stock [Member] | Subsequent Event [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Dividend per share declared |  |  |  | $ 0.18 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Date of declared dividend to be paid |  |  |  | Jun. 23, 2015 |
Record date of declared dividend |  |  |  | Jun. 15, 2015 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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