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Inventories (Tables)
 3 Months Ended
Jun. 30, 2012
Inventory, Net [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
 
June 30, 2012
 
March 31, 2012
Raw materials
$
8,439

 
$
8,065

Work in process
151,935

 
139,045

Finished goods
61,107

 
70,168

 
$
221,481

 
$
217,278