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Business Segment Information
12 Months Ended
Jul. 31, 2013
Business Segment Information [Abstract]  
Summary of operating results for the business segments
 
(in thousands)
 
Straight Path Spectrum
  
Straight Path IP
  
Total
 
Year ended July 31, 2013
         
Revenues
 $525  $605  $1,130 
Loss from operations
  (1,891)  (1,724)  (3,615)
Gain on sale of rights in wireless spectrum included in loss from operations
  150   —   150 
Loss on settlement of Straight Path Spectrum legal proceedings included in loss from operations
  (1,150)  —   (1,150)
Year ended July 31, 2012
            
Revenues
 $553  $—  $553 
Income (loss) from operations
  5,366   (585)  4,781 
Gain on sale of rights in wireless spectrum included in income from operations
  5,330   —   5,330