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Description of Business and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
 12 Months Ended
Jul. 31, 2017
USD ($)
Segment
Customer
Jul. 31, 2016
USD ($)
Customer
Jul. 31, 2015
USD ($)
Customer
Description of Business and Summary of Significant Accounting Policies (Textual)      
Number of reportable segments | Segment 3    
Investments accounted for using the equity method $ 9,800 $ 8,000  
Investments accounted for using the cost method $ 10,800 7,000  
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 $ 10,800 10,500  
Advertising expense 17,400 16,500 $ 19,700
Amortization expense related to capitalized software 14,200 12,600 11,400
Unamortized capitalized internal use software costs $ 22,800 18,800  
Tax position ultimate settlement, percentage 50.00%    
Amortization expense of intangible assets $ 300 400 400
Intangible assets finite useful lives 500 700  
Company intends to contribute in cash 6,381
IDT-Rafael Holdings, LLC [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Company's investment, ownership percentage in subsidiary 90.00%    
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 $ 2,550 $ 861  
Minimum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Company intends to contribute in cash 50,000    
Maximum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Company intends to contribute in cash $ 60,000    
Technology and domain names [Member] | Minimum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Amortization period 3 years    
Technology and domain names [Member] | Maximum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Amortization period 4 years    
Customer Lists [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Amortization period 15 years    
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 12.40% 11.20% 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 35.40% 23.00%  
Trademark [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Amortization period 5 years    
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 Excess of one year.    
Long Lived Assets [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Amortization expense of intangible assets with finite lives 2018 $ 90    
Amortization expense of intangible assets with finite lives 2019 71    
Amortization expense of intangible assets with finite lives 2020 55    
Amortization expense of intangible assets with finite lives 2021 43    
Amortization expense of intangible assets with finite lives 2022 $ 35