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Concentration of Customers (Tables)
3 Months Ended
Oct. 31, 2013
Concentration Of Customers [Abstract]  
Revenues from transactions with a single customer
 
   
Three Months Ended
October 31,
   
2013
 
2012
   
(in thousands)
Covad Communications Group
  $ 41  
na
AT&T
    31  
na
Airband Communications
    15  
na