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Inventories (Tables)
 6 Months Ended
Sep. 30, 2013
Inventory, Net [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
September 30, 2013
 
March 31, 2013
Raw materials
$
8,690

 
$
9,020

Work in process
211,917

 
181,750

Finished goods
54,517

 
51,564

 
$
275,124

 
$
242,334