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Inventories (Tables)
 6 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories consist of the following (amounts in thousands):
 
September 30, 2016
 
March 31, 2016
Raw materials
$
15,227

 
$
12,179

Work in process
292,536

 
208,283

Finished goods
116,927

 
86,353

Total inventories
$
424,690

 
$
306,815