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Revenues and Gain on Sale of Rights in Wireless Spectrum (Tables)
12 Months Ended
Jul. 31, 2014
Revenues and Gainon Sale Of Wireless Spectrum Rights [Abstract]  
Summary of revenues and gain on sale
Year ended July 31 
(in thousands)
 2014  2013 
Customer:      
TelePacific Communications $165  $165 
AT&T  114   134 
UNSI  53   -