Summary of Allowance for Doubtful Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Receivables [Abstract]
Balance at Beginning of Period	$ 177	$ 185	$ 136
Additions	42	115	81
Deductions	(95)	(123)	(32)
Balance at End of Period	$ 124	$ 177	$ 185