Schedule II Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts, Current, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts, Current
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 185	$ 136	$ 230
Additions	115	81	200
Deductions	123	32	294
Balance at End of Period	$ 177	$ 185	$ 136