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Equity (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 07, 2015
Jan. 16, 2015
Apr. 30, 2015
Jul. 31, 2015
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Sep. 30, 2014
Equity (Textual)                
Common stock issued for exercises of stock options         $ 68,000 $ 17,000    
Dividend declared     $ 5,647,342          
Amount paid to minority shareholders     875,338          
Unpaid dividends     $ 4,772,004          
Treasury stock, shares       42,000 42,000      
Sale of treasury stock         $ 65,000  
Class A common stock [Member] | Common Stock [Member]                
Equity (Textual)                
Common stock, voting rights        
Class A common stock are entitled to three votes per share
      
Common stock issued for compensation, Shares              
Common stock issued for exercises of stock options, Shares            
Common stock issued for exercises of stock options            
Common stock issued for exercises of deferred stock units, Shares            
Retirement of common stock issued to former employees of IDT Corporation, Shares              
Common stock issued or to be issued for compensation, Shares              
Class B common stock [Member]                
Equity (Textual)                
Number of shares held in treasury stock. shares     9,982 41,723,000 41,723,000     35,846
Number of shares held in treasury stock. value     $ 197,344         $ 348,051
Sale of treasury stock       $ 480,392,000        
Class B common stock [Member] | Davidi Jonas [Member] | Subsequent Event [Member]                
Equity (Textual)                
Common stock issued for compensation, Shares 60,000,000              
Class B common stock [Member] | Officer [Member]                
Equity (Textual)                
Treasury stock, shares   4,105,000            
Sale of treasury stock   $ 65,003,000            
Class B common stock [Member] | IDT[Member]                
Equity (Textual)                
Number of restricted shares issued to former employees         2,200      
Class B common stock [Member] | Common Stock [Member]                
Equity (Textual)                
Common stock, voting rights         Class B common stock are entitled to one-tenth of a vote per share.      
Common stock issued for compensation, Shares           311,000    
Common stock issued for exercises of stock options, Shares         12,000 3,000    
Common stock issued for exercises of stock options            
Common stock issued for exercises of deferred stock units, Shares         20,000 9,000    
Retirement of common stock issued to former employees of IDT Corporation, Shares           (3,000)    
Common stock issued or to be issued for compensation, Shares         265,000