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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
May 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 21,237 $ 23,308
Work in process 8,508 8,318
Finished goods 19,261 28,279
Inventories $ 49,006 $ 59,905