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Related Party Transactions (Tables)
12 Months Ended
Jul. 31, 2017
Related Party Transactions [Abstract]  
Schedule of change in Company's liability to IDT
Years ended July 31, 
(in thousands)
 2017  2016 
Balance at beginning of year $299  $369 
Payments by IDT on behalf of the Company  937   2,122 
Cash repayments, net of advances  (1,200)  (2,192)
Balance at end of year $36  $299