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Inventories (Tables)
6 Months Ended
Nov. 30, 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)Nov 30, 2021May 31, 2021
Raw materials$26,706 $22,925 
Work in process6,673 8,022 
Finished goods14,804 17,667 
Inventories$48,183 $48,614