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Inventories
6 Months Ended
Sep. 30, 2011
Inventory Net Abstract 
Inventory Disclosure Text Block
5. Inventories
       
 Inventories consist of the following (in thousands):
       
  September 30, March 31,
  2011 2011
       
  (unaudited)
 Raw materials$ 21,131 $ 19,724
 Work-in-process  38,740   38,148
 Finished goods  19,730   17,967
  Total$ 79,601 $ 75,839