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Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2014 | Apr. 30, 2015
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Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 22 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Unrealized Losses | 9 idt_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAccumulatedOtherComprehensiveIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value |  | 2,993 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Unrealized Losses |  | $ 3 idt_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAccumulatedOtherComprehensiveIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember

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- Definition Available for sale securities gross unrealized loss accumulated in accumulated other comprehensive income. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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