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Related Party Transactions (Tables)
9 Months Ended
Apr. 30, 2018
Related Party Transactions [Abstract]  
Schedule of related party transactions included in selling, general and administrative expense
    Three Months Ended
April 30,
    Nine Months Ended
April 30,
 
    2018     2017     2018     2017  
    (in thousands)     (in thousands)  
             
Payments by IDT on behalf of the Company   $ 14     $ 160     $ 274     $ 798  
Cash repayments, net of advances   $ (26 )   $ (181 )   $ (313 )   $ (1,041 )