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Equity (Tables)
 9 Months Ended
Apr. 30, 2014
Equity [Abstract]  
Changes in the components of equity
 
  
Nine Months Ended
April 30, 2014
 
  
Attributable
to Straight Path
  
Noncontrolling
Interests
  
Total
 
  
(in thousands)
 
Balance, July 31, 2013
 $14,229  $(374) $13,855 
Stock-based compensation
  628   —   628 
Net loss
  
(1,000
)  (163)  
(1,163
)
Balance, April 30, 2014
 $
13,857
  $(537) $
13,320