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Inventories (Tables)
 6 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
September 30, 2015
 
March 31, 2015
Raw materials
$
15,135

 
$
13,263

Work in process
248,277

 
197,565

Finished goods
100,348

 
68,628

 
$
363,760

 
$
279,456