Income Taxes - Additional Information (Detail) - USD ($)			3 Months Ended		12 Months Ended
	Apr. 01, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Mar. 31, 2017
Tax Credit Carryforward [Line Items]
Current tax benefit or provision			$ 0	$ 0
Income taxes paid			0	0
Deferred tax benefit or provision			0	$ 0
Federal income tax rate	37.00%	39.60%
Capital losses carryovers			1,700,000
Net operating loss carryovers			$ 140,600,000
Remaining capital loss carryovers expire			Mar. 31, 2020
Net operating loss carryovers begin to expire			Mar. 31, 2032
Deferred tax asset			$ 52,644,000
Deferred tax assets, valuation allowance			$ 59,369,000
Change in valuation allowance against net deferred tax assets					$ 800,000
Tax Year 2013 [Member]
Tax Credit Carryforward [Line Items]
Capital losses carryovers					$ 22,600,000
Tax Year 2012 [Member]
Tax Credit Carryforward [Line Items]
Capital losses carryovers						$ 158,100,000
Internal Revenue Service (IRS) [Member]
Tax Credit Carryforward [Line Items]
Statutory notification period			60 days