Goodwill Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 31,045	$ 33,003
Foreign currency translation impact	4,763	(1,958)
Ending balance	$ 35,808	$ 31,045