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Concentration of Customers and Gain on Sale of Rights in Wireless Spectrum (Tables)
6 Months Ended
Jan. 31, 2014
Concentration of Customers and Gain on Sale of Rights in Wireless Spectrum [Abstract]  
Revenues from transactions with a single customer
 
   
Six Months Ended
January 31,
 
   
2014
   
2013
 
   
(in thousands)
 
TelePacific Communications
  $ 83     $ 83  
AT&T
    59    
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