Condensed Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from (used in) operating activities
Cash receipts from interest and dividends	$ 1,609	$ 956
Cash paid for professional fees, governance costs and other administrative costs	(5,554)	(6,291)
Cash paid for Residual Wind-Down Claims and Costs	(11,705)	(4,697)
Cash receipts for refunds	193
Cash paid for distributions	(430)	(146)
Net cash flows used in operating activities	(15,887)	(10,178)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(1,752,333)	(3,176,333)
Cash from maturities and sales of marketable securities	1,767,358	3,187,657
Net cash flows from investing activities	15,025	11,324
Net (decrease) increase in cash and cash equivalents	(862)	1,146
Cash and cash equivalents, beginning of period	4,320	4,410
Cash and cash equivalents, end of period	$ 3,458	$ 5,556