Statements of Changes in Net Assets in Liquidation (Liquidation Basis) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Increase (decrease) in net assets in liquidation:
Contingent settlement obligation incurred (Note 4)	$ (15,000)
Liquidation Basis of Accounting [Member]
Net Assets in Liquidation, beginning of year	488,213	$ 611,773	$ 944,736
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)	(33,957)	(12,360)	(7,711)
Net reversal of liquidating distributions (liquidating distributions) (Note 5)	6,947	(115,374)	(128,747)
Contingent settlement obligation incurred (Note 4)	(15,000)
Net change in fair value of holdings of New GM Securities			(175,229)
Dividends and interest income (net reversal) (Notes 3 and 4)	18,600	4,174	(21,319)
Other income			43
Net decrease in net assets in liquidation	(23,410)	(123,560)	(332,963)
Net Assets in Liquidation, end of year	$ 464,803	$ 488,213	$ 611,773