XML 96 R60.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Marketable Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2015 | Jul. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 40,862 | $ 12,881
Gross Unrealized Gains |  | 12 | 1
Gross Unrealized Losses |  | (587) | (9)
Fair Value |  | 40,287 | 12,873
Certificates of Deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | [1] | 22,736 | $ 10,375
Gross Unrealized Gains | [1] | 3 |
Gross Unrealized Losses | [1] | (2) |
Fair Value | [1] | 22,737 | $ 10,375
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | $ 31
Gross Unrealized Gains |  |  |
Gross Unrealized Losses |  |  | $ (9)
Fair Value |  |  | 22
Federal Home Loan Bank bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 795 |
Gross Unrealized Gains |  |  |
Gross Unrealized Losses |  |  |
Fair Value |  | $ 795 |
International agency notes [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 1,120 |
Gross Unrealized Gains |  |  |
Gross Unrealized Losses |  | $ (1) |
Fair Value |  | 1,119 |
Mutual funds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 5,000 |
Gross Unrealized Gains |  |  |
Gross Unrealized Losses |  | $ (18) |
Fair Value |  | 4,982 |
Straight Path Communications Inc. common stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 2,086 |
Gross Unrealized Gains |  |  |
Gross Unrealized Losses |  | $ (563) |
Fair Value |  | 1,523 |
Municipal Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 9,125 | 2,475
Gross Unrealized Gains |  | 9 | $ 1
Gross Unrealized Losses |  | (3) |
Fair Value |  | $ 9,131 | $ 2,476
[1] | Each of the Company's certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

X
- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt securities classified as available-for-sale securities. + References No definition available. + Details
Name: | idt_AvailableForSaleDebtSecuritiesGrossUnrealizedGains
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale debt securities. + References No definition available. + Details
Name: | idt_AvailableForSaleDebtSecuritiesGrossUnrealizedLosses
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_MarketableSecuritiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=idt_InternationalAgencyNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=idt_MutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=idt_StraightPathCommunicationsInc.CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |