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Inventories
 9 Months Ended
Feb. 28, 2021
Inventories
3. INVENTORIES
Inventories are stated at the lower of cost, determined by the
first-in,
first-out
method, or net realizable value. The components of inventories follow:​​​​​​​​​​​​​​
 
(in thousands)
   
February 28,
2021
     
May 31,
2020
  
Raw materials
    $ 46,423      $ 45,058  
Work-in-process
      7,408        6,887  
Finished and purchased goods
      45,436        43,108  
    
 
 
     
 
 
  
    
$
 99,267
 
   
$
 95,053