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Inventories (Tables)
12 Months Ended
May 31, 2018
Inventory Disclosure [Abstract]  
Inventories
As of May 31, 2018 and 2017, inventories consisted of the following:
 
 
May 31, 2018
 
May 31, 2017
(in thousands)
 
Raw materials
$
18,678

 
$
17,563

Work in process
10,808

 
12,602

Finished goods
19,430

 
24,341

Total
$
48,916

 
$
54,506