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Other Operating Losses, Net (Tables)
12 Months Ended
Jul. 31, 2017
Other Operating Losses, Net [Abstract]  
Summary of other operating losses, net
Year ended July 31
(in thousands)
  2017     2016     2015  
Corporate —loss related to legal settlement and mutual release   $ (10,436 )   $     $  
Telecom Platform Services— loss on disposal of property, plant and equipment           (326 )      
Corporate—gain (losses) related to legal matters     24             (1,552 )
TOTAL   $ (10,412 )   $ (326 )   $ (1,552 )