Condensed Statements of Cash Flows (Liquidation Basis) (Liquidation Basis of Accounting [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Liquidation Basis of Accounting [Member]
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 9,197	$ 41
Cash paid for professional fees, governance costs and other administrative costs	(4,729)	(11,491)
Cash paid for Residual Wind-Down Claims	(646)	(1,168)
Cash receipts for refund due others	379
Cash paid for distributions	(127)	(580)
Net cash flows from (used in) operating activities	4,074	(13,198)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(45,873)	(57,035)
Cash from maturities and sales of marketable securities	55,093	103,396
Net cash flows from investing activities	9,220	46,361
Cash flows from financing activities
Cash from sale of New GM Securities for distribution	105	28
Net cash flows from financing activities	105	28
Net increase in cash and cash equivalents	13,399	33,191
Cash and cash equivalents, beginning of period	14,932	1,010
Cash and cash equivalents, end of period	$ 28,331	$ 34,201