Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 1,852	$ 2,694	$ 2,344	$ 3,601
Change in accruals for warranties during the period	25	591	152	1,009
Settlements during the period	(406)	(608)	(1,025)	(1,933)
Balance at end of period	$ 1,471	$ 2,677	$ 1,471	$ 2,677