Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents information about the GUC Trust’s assets and liabilities measured at fair value on a recurring basis at September 30, 2013 and March 31, 2013, and the valuation techniques used by the GUC Trust to determine those fair values.

	September 30, 2013
(in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	32,913	$	—	$	—	$	32,913
Marketable Securities:
Municipal commercial paper and demand notes		—		18,349		—		18,349
Corporate commercial paper		—		12,086		—		12,086
Holdings of New GM Securities
New GM Common Stock		1,024,290		—		—		1,024,290
New GM Warrants		1,165,447		—		—		1,165,447
Total Assets	$	2,222,650	$	30,435	$	—	$	2,253,085
Liabilities:
Liquidating distributions payable	$	100,447	$	—	$	—	$	100,447

	March 31, 2013
(in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	354	$	—	$	—	$	354
Marketable Securities:
Municipal commercial paper and demand notes		—		61,006		—		61,006
Corporate commercial paper		—		15,790		—		15,790
Holdings of New GM Securities
New GM Common Stock		798,848		—		—		798,848
New GM Warrants		792,262		—		—		792,262
Total Assets	$	1,591,464	$	76,796	$	—	$	1,668,260
Liabilities:
Liquidating distributions payable	$	16,555	$	—	$	—	$	16,555