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Inventories (Tables)
 9 Months Ended
Dec. 31, 2012
Inventory, Net [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
 
December 31, 2012
 
March 31, 2012
Raw materials
$
8,730

 
$
8,065

Work in process
188,974

 
139,045

Finished goods
63,890

 
70,168

 
$
261,594

 
$
217,278