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Goodwill (Tables)
12 Months Ended
Jul. 31, 2017
Goodwill [Abstract]  
Schedule of change in carrying amount of goodwill
(in thousands)   
Balance at July 31, 2015 $2,438 
Foreign currency translation adjustments  (77)
Balance at July 31, 2016  2,361 
Foreign currency translation adjustments  157 
Balance at July 31, 2017 $2,518