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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Feb. 28, 2019
Feb. 28, 2018
Inventory Disclosure [Abstract]    
Raw material $ 21,717 $ 15,854
Work-in-process 4,172 3,114
Finished goods 9,522 7,512
Inventories $ 35,411 $ 26,480