XML 19 R104.htm IDEA: XBRL DOCUMENT
v3.19.3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | $ (4,972) |  |  |
Net other comprehensive income (loss) attributable to IDT Corporation | 81 | $ (359) | $ 1,401 |
Ending balance | (4,858) | (4,972) |  |
Unrealized (loss) gain on available-for-sale securities [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (34) | 2,134 | 8 |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification |  | (193) | 2,449 |
Net other comprehensive income (loss) attributable to IDT Corporation | 1 | (177) | 2,126 | [1]
Rafael Spin-Off |  | (1,991) |  |
Adjustment from the adoption of change in accounting for equity investments (see Note 8) | 33 |  |  |
Adjusted balance at August 1, 2018 | (1) |  |  |
Ending balance |  | (34) | 2,134 |
Unrealized (loss) gain on available-for-sale securities [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income |  | 16 | (323) |
Foreign currency translation [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (4,938) | (4,477) | (3,752) |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification |  | (182) | (725) |
Net other comprehensive income (loss) attributable to IDT Corporation | 80 | (182) | (725) | [1]
Rafael Spin-Off |  | (279) |  |
Adjustment from the adoption of change in accounting for equity investments (see Note 8) |  |  |  |
Adjusted balance at August 1, 2018 | (4,938) |  |  |
Ending balance | (4,858) | (4,938) | (4,477) |
Foreign currency translation [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income |  |  |  |
Accumulated other comprehensive income (loss) [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (4,972) | (2,343) | (3,744) |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification |  | (375) | 1,724 |
Net other comprehensive income (loss) attributable to IDT Corporation | 81 | (359) | 1,401 | [1]
Rafael Spin-Off |  | (2,270) |  |
Adjustment from the adoption of change in accounting for equity investments (see Note 8) | 33 |  |  |
Adjusted balance at August 1, 2018 | (4,939) |  |  |
Ending balance | $ (4,858) | (4,972) | (2,343) |
Accumulated other comprehensive income (loss) [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income |  | $ 16 | $ (323) |
[1] | In fiscal 2017, net other comprehensive income attributable to IDT Corporation from unrealized gains on available-for-sale securities included unrealized gains on the Rafael convertible promissory notes of $2.1 million and unrealized gains, net on marketable securities of $26,000.

X
- Definition Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | idt_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAdjusted
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | idt_ScheduleOfAccumulatedBalancesForEachClassificationOfOtherComprehensiveIncomeLossAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts. + References No definition available. + Details
Name: | idt_ShareholdersEquityNoteSpinOffTransaction
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=idt_AccumulatedOtherComprehensiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |