Condensed Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 4,386	$ 12,678
Cash paid for professional fees, governance costs and other administrative costs	(11,039)	(9,449)
Cash paid for Residual Wind-Down Claims	(6,022)	(2,011)
Cash receipts for refunds, including amounts due others	204	379
Cash paid for distributions	(130,036)	(3,528)
Net cash flows used in operating activities	(142,507)	(1,931)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(1,316,196)	(66,302)
Cash from maturities and sales of marketable securities	703,962	78,597
Net cash flows (used in) from investing activities	(612,234)	12,295
Cash flows from financing activities
Cash from liquidation of New GM Securities and sale of New GM Securities for distribution	741,702	212
Net cash flows from financing activities	741,702	212
Net (decrease) increase in cash and cash equivalents	(13,039)	10,576
Cash and cash equivalents, beginning of period	37,483	14,932
Cash and cash equivalents, end of period	$ 24,444	$ 25,508