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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.