Statements of Changes in Net Assets in Liquidation (Liquidation Basis) (Liquidation Basis of Accounting [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Liquidation Basis of Accounting [Member]
Net Assets in Liquidation, beginning of year	$ 1,064,494	$ 1,390,181	$ 1,369,239
Increase (decrease) in net assets in liquidation:
Net (additions to) reductions in reserves for Expected Costs of Liquidation	(9,375)	7,910	(17,488)
Liquidating distributions (Note 5)	(209,929)	(1,205,764)	(29,389)
Net change in fair value of holdings of New GM Securities	56,241	702,654	123,936
Dividends and interest income	43,305	4,668	145
Income tax benefit (provision) (Note 9)		164,845	(56,262)
Net (decrease) increase in net assets in liquidation	(119,758)	(325,687)	20,942
Net Assets in Liquidation, end of year	$ 944,736	$ 1,064,494	$ 1,390,181