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Inventories (Tables)
9 Months Ended
Feb. 28, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories are stated at lower of cost and net realizable value (using the first-in, first-out method). Inventories consisted of the following:
(in thousands)Feb 28, 2021May 31, 2020
Raw materials$21,237 $23,308 
Work in process8,508 8,318 
Finished goods19,261 28,279 
Inventories$49,006 $59,905