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12. OTHER EXPENSE, NET (Tables)
 12 Months Ended
May 31, 2018
Other Income and Expenses [Abstract]  
Other expense, net

    Other expense, net comprises the following (in thousands):

 

   Year Ended May 31,
   2018  2017  2016
Foreign exchange (loss) gain  $(63)  $(21)  $(19)
Other income, net   2    —      3 
   $(61)  $(21)  $(16)