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Inventories - Schedule of Inventories from Continuing Operations (Detail) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 7,198 $ 5,828
Work in process 3,447 3,137
Finished goods 736 154
Total inventories $ 11,381 $ 9,119