Inventories (Notes)

3 Months Ended

Jun. 30, 2015

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



	June 30, 2015		March 31, 2015
Raw materials	$	14,066	$	13,263
Work in process	216,390		197,565
Finished goods	73,234		68,628
	$	303,690	$	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.