Inventories (Tables)

12 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Components of inventories

The components of inventories consist of the following (amounts in thousands):

	March 31, 2013		March 31, 2012
Raw materials	$	9,020	$	8,065
Work in process	181,750		139,045
Finished goods	51,564		70,168
	$	242,334	$	217,278