Condensed Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 956	$ 4,149
Cash paid for professional fees, governance costs and other administrative costs	(6,297)	(7,433)
Cash paid for Residual Wind-Down Claims	(4,691)	(3,356)
Cash paid for distributions	(146)	(46)
Net cash flows used in operating activities	(10,178)	(6,686)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(3,176,333)	(793,948)
Cash from maturities and sales of marketable securities	3,187,657	62,886
Net cash flows from (used in) investing activities	11,324	(731,062)
Cash flows from financing activities
Cash from liquidation of New GM Securities		741,702
Net cash flows from financing activities		741,702
Net increase in cash and cash equivalents	1,146	3,954
Cash and cash equivalents, beginning of period	4,410	37,483
Cash and cash equivalents, end of period	$ 5,556	$ 41,437