Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from (used in) operating activities
Cash receipts from interest and dividends	$ 4,803	$ 1,645	$ 4,722
Cash paid for professional fees, governance costs and other administrative costs	(11,886)	(11,683)	(13,223)
Cash paid for Residual Wind-Down Claims and Costs	(11,705)	(10,339)	(6,210)
Cash paid for distributions	(433)	(112,382)	(130,045)
Cash receipts for refunds, including amounts due others	196		158
Net cash flows used in operating activities	(19,025)	(132,759)	(144,598)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(3,553,448)	(5,624,032)	(1,984,516)
Cash from maturities and sales of marketable securities	3,570,716	5,762,701	1,354,339
Net cash flows from (used in) investing activities	17,268	138,669	(630,177)
Cash flows from financing activities
Cash from sale and liquidation of New GM Securities			741,702
Cash in Administrative Fund returned to DIP Lenders		(6,000)
Net cash flows (used in) from financing activities		(6,000)	741,702
Net decrease in cash and cash equivalents	(1,757)	(90)	(33,073)
Cash and cash equivalents, beginning of year	4,320	4,410	37,483
Cash and cash equivalents, end of year	$ 2,563	$ 4,320	$ 4,410