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Commitments and Contingencies (Tables)
 9 Months Ended
Apr. 30, 2017
Commitments and Contingencies [Abstract]  
Schedule of restricted cash and cash equivalents
  April 30,
2017		  July 31,
2016		 
  (in thousands) 
IDT Financial Services customer deposits $92,955  $98,500 
Related to letters of credit  99   122 
Other  196   200 
Total restricted cash and cash equivalents $93,250  $98,822