Inventories (Tables)

9 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

Components of inventories

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

	December 31, 2016		March 31, 2016
Raw materials	$	14,733	$	12,179
Work in process	267,399		208,283
Finished goods	137,486		86,353
Total inventories	$	419,618	$	306,815