Statements of Cash Flows (Liquidation Basis) (Liquidation Basis of Accounting [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Liquidation Basis of Accounting [Member]
Cash flows from (used in) operating activities
Cash receipts from interest and dividends	$ 16,113	$ 4,658	$ 151
Cash paid for professional fees, governance costs and other administrative costs	(12,778)	(20,948)	(39,263)
Cash paid for Residual Wind-Down Claims	(2,618)	(1,678)	(1,387)
Cash receipts for refund due to others	379
Cash paid for distributions of dividends on New GM Common Stock	(3,361)
Cash paid for distributions in lieu of shares and warrants	(203)	(663)	(668)
Net cash flows used in operating activities	(2,468)	(18,631)	(41,167)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(83,754)	(118,162)	(187,427)
Cash from maturities and sales of marketable securities	97,194	150,576	185,721
Net cash flows from (used in) investing activities	13,440	32,414	(1,706)
Cash flows from (used in) financing activities
Cash from sale of New GM Securities to fund Expected Costs of Liquidation	11,367		17,969
Cash from sale of New GM Securities for distribution in lieu of shares and warrants	212	139	1,233
Cash transferred to the Avoidance Action Trust			(13,715)
Net cash flows from financing activities	11,579	139	5,487
Net increase (decrease) in cash and cash equivalents	22,551	13,922	(37,386)
Cash and cash equivalents, beginning of year	14,932	1,010	38,396
Cash and cash equivalents, end of year	$ 37,483	$ 14,932	$ 1,010