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Inventories (Tables)
6 Months Ended
Nov. 30, 2012
Inventories [Abstract]  
Inventories
                 
    Nov 30,
2012
    May 31,
2012
 
    (in thousands)  

Raw materials

  $ 20,271     $ 18,984  

Work in process

    9,349       9,504  

Finished goods

    32,710       27,335  
   

 

 

   

 

 

 

Inventories

  $ 62,330     $ 55,823