Condensed Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 4,149	$ 9,197
Cash paid for professional fees, governance costs and other administrative costs	(7,433)	(4,729)
Cash paid for Residual Wind-Down Claims	(3,356)	(646)
Cash receipts for refund due others		379
Cash paid for distributions	(46)	(127)
Net cash flows (used in) from operating activities	(6,686)	4,074
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(793,948)	(45,873)
Cash from maturities and sales of marketable securities	62,886	55,093
Net cash flows (used in) from investing activities	(731,062)	9,220
Cash flows from financing activities
Cash from liquidation of New GM Securities and sale for distribution	741,702	105
Net cash flows from financing activities	741,702	105
Net increase in cash and cash equivalents	3,954	13,399
Cash and cash equivalents, beginning of period	37,483	14,932
Cash and cash equivalents, end of period	$ 41,437	$ 28,331