Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	$ 76,111
Plus:
Funding for expected costs from MLC		63,012
Plus additions to reserves	17,488	52,994
Less liquidation costs incurred:
Ending Balance	61,513	76,111
Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(25,487)	(35,879)
Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(6,205)	(3,584)
Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(394)	(432)
Reserve for Expected Wind-Down Costs [Member]
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	56,815
Plus:
Funding for expected costs from MLC		52,734
Plus additions to reserves	5,195	32,434
Less liquidation costs incurred:
Ending Balance	38,043	56,815
Reserve for Expected Wind-Down Costs [Member] | Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(19,712)	(25,320)
Reserve for Expected Wind-Down Costs [Member] | Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(4,191)	(2,866)
Reserve for Expected Wind-Down Costs [Member] | Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(64)	(167)
Reserve for Expected Reporting Costs [Member]
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	13,320
Plus:
Plus additions to reserves	12,293	20,560
Less liquidation costs incurred:
Ending Balance	20,442	13,320
Reserve for Expected Reporting Costs [Member] | Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(2,985)	(6,975)
Reserve for Expected Reporting Costs [Member] | Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(1,866)
Reserve for Expected Reporting Costs [Member] | Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(320)	(265)
Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member]
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	647
Plus:
Funding for expected costs from MLC		1,365
Plus additions to reserves
Less liquidation costs incurred:
Ending Balance	499	647
Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member] | Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred
Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member] | Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(148)	(718)
Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member] | Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred
Reserve for Avoidance Action Defense Costs [Member]
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	1,280
Plus:
Funding for expected costs from MLC		1,358
Plus additions to reserves
Less liquidation costs incurred:
Ending Balance	898	1,280
Reserve for Avoidance Action Defense Costs [Member] | Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(382)	(78)
Reserve for Avoidance Action Defense Costs [Member] | Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred
Reserve for Avoidance Action Defense Costs [Member] | Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred
Reserve for Residual Wind-Down Costs [Member]
Summary of activity in reserves for expected costs of liquidation including expected reporting costs
Beginning Balance	4,049
Plus:
Funding for expected costs from MLC		7,555
Plus additions to reserves
Less liquidation costs incurred:
Ending Balance	1,631	4,049
Reserve for Residual Wind-Down Costs [Member] | Trust Professionals [Member]
Less liquidation costs incurred:
Liquidation costs incurred	(2,408)	(3,506)
Reserve for Residual Wind-Down Costs [Member] | Trust Governance [Member]
Less liquidation costs incurred:
Liquidation costs incurred
Reserve for Residual Wind-Down Costs [Member] | Other Administrative Expenses [Member]
Less liquidation costs incurred:
Liquidation costs incurred	$ (10)