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Inventories (Tables)
12 Months Ended
May 31, 2016
Inventory Disclosure [Abstract]  
Inventories
As of May 31, 2016 and 2015, inventories consisted of the following:
 
 
May 31, 2016
 
May 31, 2015
 
(in thousands)
Raw materials
$
21,669

 
$
28,040

Work in process
10,700

 
11,910

Finished goods
23,001

 
27,438

Total
$
55,370

 
$
67,388