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Inventories
12 Months Ended
May 31, 2012
Inventory Disclosure [Abstract]  
Inventories
5. INVENTORIES
 
Inventories consist of the following at May 31:
 
 
2012
 
2011
Raw materials
 
$
12,480

 
$
18,282

Work in process
 
1,304

 
1,781

Finished goods
 
27,624

 
14,860

Total
 
$
41,408

 
$
34,923