Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 3,601	$ 3,934
Change in accruals for warranties during the period	1,219	1,865
Settlements during the period	(2,476)	(2,198)
Balance at end of period	$ 2,344	$ 3,601