Statements of Changes in Net Assets in Liquidation (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net Assets in Liquidation, beginning of year	$ 611,773	$ 944,736	$ 1,064,494
Increase (decrease) in net assets in liquidation:
Net additions to reserves for Expected Costs of Liquidation and Residual Wind-Down Claims and Costs (Note 7)	(12,360)	(7,711)	(9,375)
Liquidating distributions (Note 5)	(115,374)	(128,747)	(209,929)
Net change in fair value of holdings of New GM Securities		(175,229)	56,241
Dividends and interest income (net reversal) (Note 3)	4,174	(21,319)	43,305
Other income		43
Net decrease in net assets in liquidation	(123,560)	(332,963)	(119,758)
Net Assets in Liquidation, end of year	$ 488,213	$ 611,773	$ 944,736