Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Balance at beginning of period	$ 2,709	$ 5,896
Change in accruals for warranties during the period	1,717	1,371
Settlements during the period	(1,219)	(4,558)
Balance at end of period	$ 3,207	$ 2,709