Inventories - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Inventory Disclosure [Abstract]
Finished goods	$ 2,751	$ 1,024
Work in process	5,932	7,350
Purchased and manufactured parts	13,155	12,532
Inventories, gross	21,838	20,906
Reserve for slow moving and obsolescence	(2,929)	(3,116)
Total	$ 18,909	$ 17,790