Net Assets in Liquidation - Additional Information (Detail)		3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2011 USD ($)	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares
Net Assets in Liquidation [Line Items]
Distributable Assets		$ 54,700,000		$ 54,700,000
Cash and cash equivalents and marketable securities		122,500,000		122,500,000
Liquidating distributions payable		57,235,000		57,235,000	$ 351,876,000
Distributable Cash set aside for projected Trust fees, costs and expenses		34,300,000		34,300,000
Distributable cash pending distribution or set aside and not available for distribution		36,800,000		36,800,000
Change in Future Investment Income		54,000		750,000
Amount required to issue one Trust Unit per contingent rights	$ 1,000
Allowed General Unsecured Claims	$ 29,771,000,000
noticing costs paid			$ 2,000,000
liquidating distributions payable to holders of Allowed General Unsecured Claims and GUC Trust Beneficiaries		2,500,000		2,500,000
Settlement Consideration				50,000,000
Settlement Obligation				48,000,000	48,000,000
Allowed and Disputed Claims [Member]
Net Assets in Liquidation [Line Items]
Allowed General Unsecured Claims		32,086,000,000		32,086,000,000
GUC Trust Units [Member]
Net Assets in Liquidation [Line Items]
Liquidating distributions payable		57,200,000		57,200,000
Liquidating distributions payable to Guc unit holders		54,700,000		54,700,000
Accrued Future Investment Income		$ 46,000		$ 46,000	$ 800,000
Outstanding or issuable GUC Trust Units | shares		32,086,501		32,086,501	32,086,501
liquidating distributions payable to holders of Allowed General Unsecured Claims and GUC Trust Beneficiaries		$ 2,500,000		$ 2,500,000