Inventories (Notes)

12 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

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

	March 31, 2016		March 31, 2015
Raw materials	$	12,179	$	13,263
Work in process	208,283		197,565
Finished goods	86,353		68,628
Total inventories	$	306,815	$	279,456

Inventories are valued at the lower of cost or market using the first-in, first-out method. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable.