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Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 USD ($) Segment Customer | Jul. 31, 2017 USD ($) Customer | Jul. 31, 2016 USD ($) Customer | Aug. 02, 2018 USD ($)
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Number of reportable segments | Segment | 2 |  |  |
Investments accounted for using the equity method | $ 4,600 | $ 9,800 |  |
Investments accounted for using the cost method | $ 3,000 | 10,800 |  |
Percentage of advertising revenue, description | Over 90% of its revenues from selling its advertising inventory to advertising networks, advertising exchanges, and direct arrangements with advertisers. |  |  |
Restricted cash and cash equivalents | $ 10,700 | 10,800 |  |
Advertising expense | 16,300 | 17,400 | $ 16,500 |
Amortization expense related to capitalized software | 16,100 | 14,200 | $ 12,600 |
Unamortized capitalized internal use software costs | $ 24,900 | 22,800 |  |
Tax position ultimate settlement, percentage | 50.00% |  |  |
Concentration risk, description | No single customer accounted for more than 10% of consolidated revenues. |  |  |
Financial instruments initial application period cumulative effect transition description | At August 1, 2018, the cumulative effect of adopting this ASU is expected to be a $1.2 million increase in "Investments", a $0.1 million decrease in "Accumulated other comprehensive loss" and a $1.1 million reduction to "Accumulated deficit". |  |  |
Deferred revenue cumulative effect transition, description | At August 1, 2018, the cumulative effect of initially applying ASC 606 is expected to be a $8.6 million reduction to "Deferred revenue", with an offsetting reduction to "Accumulated deficit". This adjustment is primarily due to a change in accounting for breakage primarily from the Company's Boss Revolution international calling service, traditional calling cards, and international and domestic top-up. A customer's nonrefundable prepayment gives the customer a right to receive a good or service in the future (and obliges the Company to stand ready to transfer a good or service). However, customers may not exercise all of their contractual rights. Those unexercised rights are referred to as breakage. Prior to the adoption of ASC 606, the Company recorded breakage revenue when the likelihood of the customer exercising its remaining rights became remote. The Company generally deemed the likelihood remote after 12 or 24 months of no activity. Per ASC 606, if an entity expects to be entitled to a breakage amount, the entity should recognize the expected breakage amount as revenue in proportion to the pattern of rights exercised by the customer, but only to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the breakage is subsequently resolved. The Company determined that $8.6 million included in its opening balance of "Deferred revenue". |  |  |
TOTAL CURRENT ASSETS HELD FOR SALE | $ 137,272 | 124,267 |  |
Other current assets | 28,517 | 18,749 |  |
ASU 2016-18 [Member] | Cash Cash Equivalents And Restricted Cash [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Aggregate cash, cash equivalents and restricted cash and cash equivalents | 203,200 |  |  |
TOTAL CURRENT ASSETS HELD FOR SALE | 134,800 |  |  |
Other current assets | 300 |  |  |
Financial Instruments [Member] | Subsequent Event [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Cumulative effect adjustment |  |  |  | $ 1,100
IDT Financial Services Holding Limited [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Allowance for doubtful accounts included in held for sale | 2,200 | 2,600 |  |
TOTAL CURRENT ASSETS HELD FOR SALE | $ 137,272 | $ 124,267 |  |
Revenues [Member] | Subsequent Event [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Cumulative effect adjustment |  |  |  | $ 8,600
Customer Lists [Member] | Revenues [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Number of customers | Customer | 5 | 5 | 5 |
Concentration risk, percentage | 12.50% | 12.40% | 11.20% |
Customer Lists [Member] | Receivables [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Number of customers | Customer | 5 | 5 |  |
Concentration risk, percentage | 18.70% | 35.40% |  |
Equipment [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 7 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 5 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 20 years |  |  |
Buildings [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 40 years |  |  |
Computer Software [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 3 years |  |  |
Computer Software [Member] | Minimum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 2 years |  |  |
Computer Software [Member] | Maximum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 5 years |  |  |
Furniture and fixtures [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 7 years |  |  |
Furniture and fixtures [Member] | Minimum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 5 years |  |  |
Furniture and fixtures [Member] | Maximum [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of long-lived assets | 10 years |  |  |
Internal-use Software [Member] |  |  |  |
Description of Business and Summary of Significant Accounting Policies (Textual) |  |  |  |
Estimated useful lives of internal-use software | Capitalizes the cost of internal-use software that has a useful life in excess of one year. |  |  |

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