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Inventories - Schedule of Inventories Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
May 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 5,180us-gaap_InventoryRawMaterials $ 5,135us-gaap_InventoryRawMaterials
Work in process 2,915us-gaap_InventoryWorkInProcess 3,174us-gaap_InventoryWorkInProcess
Finished goods 1,060us-gaap_InventoryFinishedGoods 318us-gaap_InventoryFinishedGoods
Total inventories $ 9,155us-gaap_InventoryNet $ 8,627us-gaap_InventoryNet