Schedule II Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts, Current, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts, Current
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 136	$ 230	$ 274
Additions	81	200	181
Deductions	32	294	225
Balance at End of Period	$ 185	$ 136	$ 230