Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2015

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 March 31, 2015 and 2014, and the valuation techniques used by the GUC Trust to determine those fair values.

	March 31, 2015
(in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	19,150	$	—	$	—	$	19,150
Marketable Securities:
Municipal commercial paper and demand notes		—		12,064		—		12,064
Corporate commercial paper		—		18,880		—		18,880
Holdings of New GM Securities:
New GM Common Stock		427,151		—		—		427,151
New GM Warrants		490,826		—		—		490,826
Total Assets	$	937,127	$	30,944	$	—	$	968,071
Liabilities:
Liquidating distributions payable	$	7,714	$	—	$	—	$	7,714

	March 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	8,953	$	—	$	—	$	8,953
Marketable Securities:
Municipal commercial paper and demand notes		—		18,005		—		18,005
Corporate commercial paper		—		26,377		—		26,377
Holdings of New GM Securities:
New GM Common Stock		526,533		—		—		526,533
New GM Warrants		587,545		—		—		587,545
Total Assets	$	1,123,031	$	44,382	$	—	$	1,167,413
Liabilities:
Liquidating distributions payable	$	42,111	$	—	$	—	$	42,111