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Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Jun. 04, 2018
Dec. 14, 2017
May 31, 2018
Apr. 16, 2018
Nov. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Sep. 19, 2017
Sep. 14, 2017
Equity (Textual)                  
Dividends paid per share in cash           $ 0.47      
Proceeds from exercise of stock options           $ 835    
IDT-Rafael Holdings, LLC [Member]                  
Equity (Textual)                  
Ownership percentage           90.00%      
IDT Corporation [Member] | IDT-Rafael Holdings, LLC [Member]                  
Equity (Textual)                  
Percentage of contractual right to receive additional shares                 9.00%
Common Stock [Member]                  
Equity (Textual)                  
Aggregate dividends paid on common stock including Class A and Class B.           $ 11,700 $ 13,200    
Howard S. Jonas [Member] | IDT-Rafael Holdings, LLC [Member]                  
Equity (Textual)                  
Percentage of contractual right to receive additional shares                 1.00%
Howard S. Jonas [Member] | IDT Corporation [Member]                  
Equity (Textual)                  
Percentage of contractual right to receive additional shares               9.00%  
Howard S. Jonas [Member] | Subsequent Event [Member]                  
Equity (Textual)                  
Aggregate purchase price     $ 1,500            
Rafael Pharmaceuticals, Inc. [Member] | IDT-Rafael Holdings, LLC [Member]                  
Equity (Textual)                  
Percentage of contractual right to receive additional shares           10.00%      
Lipomedix [Member]                  
Equity (Textual)                  
Ownership percentage         50.60%        
Common Class A [Member]                  
Equity (Textual)                  
Dividends paid per share in cash           $ 0.47 $ 0.57    
Common Class A [Member] | Subsequent Event [Member]                  
Equity (Textual)                  
Dividends paid per share in cash $ 0.09                
Paid date of declared dividend Jun. 29, 2018                
Record date of declared dividend Jun. 19, 2018                
Common Class B [Member]                  
Equity (Textual)                  
Dividends paid per share in cash           $ 0.47 $ 0.57    
Class B common stock shares purchased options           8,000,000      
Stock repurchase program, remaining number of shares authorized to be repurchased           8,000,000      
Common Class B [Member] | Subsequent Event [Member]                  
Equity (Textual)                  
Dividends paid per share in cash $ 0.09                
Paid date of declared dividend Jun. 29, 2018                
Record date of declared dividend Jun. 19, 2018                
Common Class B [Member] | Howard S. Jonas [Member]                  
Equity (Textual)                  
Aggregate purchase price       $ 15,000          
Common stock shares purchased       2,546,689          
Class B common stock at a price per share       $ 5.89          
Common Class B [Member] | Employee [Member]                  
Equity (Textual)                  
Aggregate purchase price of shares repurchased           $ 100 $ 1,800    
Class B common stock shares repurchased           5,170 94,338    
Common Class B [Member] | 2015 Stock Option and Incentive Plan [Member]                  
Equity (Textual)                  
Additional shares available stock option incentive plan for grants   300,000              
Proceeds from exercise of stock options             $ 800,000    
Stock issued for stock option exercises           73,471