Fair Value Measurements (Tables)

9 Months Ended

Dec. 31, 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 December 31, 2013 and March 31, 2013, and the valuation techniques used by the GUC Trust to determine those fair values.

	December 31, 2013
(in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	8,435	$	—	$	—	$	8,435
Marketable Securities:
Municipal commercial paper and demand notes		—		18,110		—		18,110
Corporate commercial paper		—		31,625		—		31,625
Holdings of New GM Securities:								—
New GM Common Stock		627,258		—		—		627,258
New GM Warrants		757,047		—		—		757,047
Total Assets	$	1,392,740	$	49,735	$	—	$	1,442,475
Liabilities:
Liquidating distributions payable	$	8,466	$	—	$	—	$	8,466

	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