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Commitments and Contingencies (Tables)
 12 Months Ended
Jul. 31, 2015
Commitments and Contingencies [Abstract]  
Summary of future minimum payments for operating leases

    
(in thousands)   
Year ending July 31:   
2016 $3,439 
2017  2,653 
2018  1,307 
2019  780 
2020  654 
Thereafter  128 
Total payments $8,961 

 
Schedule of restricted cash and cash equivalents

       
July 31      
(in thousands) 2015  2014 
Restricted cash and cash equivalents—short-term        
Letters of credit related $3,163  $665 
IDT Financial Services customer deposits  87,613   64,415 
Other  259   626 
Total short-term  91,035   65,706 
Restricted cash and cash equivalents—long-term        
Letters of credit related  —   2,763 
Total restricted cash and cash equivalents $91,035  $68,469