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Revolving Credit Loan Payable (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 12, 2012 USD ($) BasisPoint | Jul. 31, 2017 USD ($) | Jul. 31, 2016 USD ($)
Revolving Credit Loan Payable (Textual) |  |  |
Maximum principal amount of credit agreement | $ 25.0 |  |
Unused outstanding amount | $ 25.0 |  |
Line of credit maturity date |  | Apr. 30, 2018 |
Average percentage of commitment fee per annum | 0.375% |  |
Maximum amount of investments in and advances to affiliates at fair value | $ 110.0 |  |
Aggregate loans and advances to affiliates and subsidiaries |  | $ 94.9 | $ 91.1
Line of credit utilized for letters of credit outstanding amount |  |  |
Line of credit [Member] |  |  |
Revolving Credit Loan Payable (Textual) |  |  |
Line of credit facility, outstanding |  |  |
July 12, 2012 [Member] |  |  |
Revolving Credit Loan Payable (Textual) |  |  |
Interest rate description |  | The principal outstanding bears interest per annum, at the option of IDT Telecom, at either (a) the U.S. Prime Rate less 125 basis points, or (b) the LIBOR rate adjusted by the Regulation D maximum reserve requirement plus 150 basis points. |
Prime Rate [Member] |  |  |
Revolving Credit Loan Payable (Textual) |  |  |
U.S. Prime rate basis points | BasisPoint | 125 |  |

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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