Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2013	Mar. 31, 2012
Liquidation Date, Expected to Complete	Apr. 30, 2022
Operating Loss Carryforwards	$ 139.3
Capital loss carryovers	$ 1.7	$ 1.7	$ 1.7	$ 22.6	$ 158.1

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant