Provision for Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal	$ 3,071	$ (596)
Foreign, state and other	8	5
Prior year federal and state, with interest	119	154
Deferred:
Federal	272	540
Foreign, state and other	(9)	69
Provision for income tax expense	$ 3,461	$ 172