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Inventories
3 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
4. Inventories
Inventories consist of the following (in thousands):
                 
    June 30,     March 31,  
    2011     2011  
 
               
Raw materials
  $ 17,088     $ 10,208  
Work in process
    8,354       2,499  
Finished goods and other
    33,588       3,329  
 
           
 
               
 
  $ 59,030     $ 16,036