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Inventories (Tables)
 3 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
 
June 30, 2011
 
March 31, 2011
Raw materials
$
9,568


 
$
8,174


Work in process
160,429


 
141,462


Finished Goods
32,458


 
31,164


 
$
202,455


 
$
180,800