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Inventories
6 Months Ended
Nov. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
INVENTORIES
Inventories are stated at lower of cost (using the first-in, first-out method) or market. As of November 30, 2015 and May 31, 2015, inventories consisted of the following:
 
Nov 30, 2015
 
May 31, 2015
 
(in thousands)
Raw materials
$
30,903

 
$
28,040

Work in process
11,171

 
11,910

Finished goods
28,739

 
27,438

Inventories
$
70,813

 
$
67,388