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Commitments and Contingencies (Tables)
9 Months Ended
Apr. 30, 2013
Commitments and Contingencies [Abstract]  
Restricted Cash and Cash Equivalents
   
April 30,
2013
   
July 31,
2012
 
   
(in thousands)
 
Restricted cash and cash equivalents-short-term
           
Letters of credit related
  $ 3,495     $ 1,430  
IDT Financial Services customer deposits
    25,294       11,154  
Other
    269       52  
                 
Total short-term
    29,058       12,636  
Restricted cash and cash equivalents-long-term
               
Letters of credit related
    2,767       2,763  
IDT Financial Services related
    6,704       6,703  
                 
Total long-term
    9,471       9,466  
                 
Total restricted cash and cash equivalents
  $ 38,529     $ 22,102