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Inventories - Schedule of Inventories from Continuing Operations (Detail) - USD ($)
$ in Thousands
May 31, 2017
May 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 7,734 $ 7,198
Work in process 4,030 3,447
Finished goods 469 736
Total inventories $ 12,233 $ 11,381