Inventories (Tables)

6 Months Ended

Sep. 30, 2012

Inventory, Net [Abstract]

Components of inventories

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

	September 30, 2012		March 31, 2012
Raw materials	$	7,934	$	8,065
Work in process	187,734		139,045
Finished goods	93,858		70,168
	$	289,526	$	217,278