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Inventories
3 Months Ended
Jun. 30, 2011
Inventory Net Abstract  
Inventory Disclosure Text Block
5. Inventories
       
 Inventories consist of the following (in thousands):
       
  June 30, March 31,
  2011 2011
       
  (unaudited)
 Raw materials$ 18,921 $ 19,724
 Work in process  38,358   38,148
 Finished goods  18,344   17,967
  Total$ 75,623 $ 75,839