Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																												3 Months Ended						3 Months Ended						3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Trust Professionals [Member]	Jun. 30, 2012 Trust Professionals [Member]	Jun. 30, 2013 Trust Governance [Member]	Jun. 30, 2012 Trust Governance [Member]	Jun. 30, 2013 Other Administrative Expenses [Member]	Jun. 30, 2012 Other Administrative Expenses [Member]	Jun. 30, 2013 Reserve for Expected Wind-Down Costs [Member]	Jun. 30, 2012 Reserve for Expected Wind-Down Costs [Member]	Jun. 30, 2013 Reserve for Expected Wind-Down Costs [Member] Trust Professionals [Member]	Jun. 30, 2012 Reserve for Expected Wind-Down Costs [Member] Trust Professionals [Member]	Jun. 30, 2013 Reserve for Expected Wind-Down Costs [Member] Trust Governance [Member]	Jun. 30, 2012 Reserve for Expected Wind-Down Costs [Member] Trust Governance [Member]	Jun. 30, 2013 Reserve for Expected Wind-Down Costs [Member] Other Administrative Expenses [Member]	Jun. 30, 2012 Reserve for Expected Wind-Down Costs [Member] Other Administrative Expenses [Member]	Jun. 30, 2013 Reserve for Expected Reporting Costs [Member]	Jun. 30, 2012 Reserve for Expected Reporting Costs [Member]	Jun. 30, 2013 Reserve for Expected Reporting Costs [Member] Trust Professionals [Member]	Jun. 30, 2012 Reserve for Expected Reporting Costs [Member] Trust Professionals [Member]	Jun. 30, 2013 Reserve for Expected Reporting Costs [Member] Trust Governance [Member]	Jun. 30, 2012 Reserve for Expected Reporting Costs [Member] Trust Governance [Member]	Jun. 30, 2013 Reserve for Expected Reporting Costs [Member] Other Administrative Expenses [Member]	Jun. 30, 2012 Reserve for Expected Reporting Costs [Member] Other Administrative Expenses [Member]	Jun. 30, 2013 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member]	Mar. 31, 2013 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member]	Jun. 30, 2012 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member]	Mar. 31, 2012 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member]	Jun. 30, 2013 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member] Trust Governance [Member]	Jun. 30, 2012 Reserve for Indenture Trustee/Fiscal and Paying Agent Costs [Member] Trust Governance [Member]	Jun. 30, 2013 Reserve for Avoidance Action Defense Costs [Member]	Mar. 31, 2013 Reserve for Avoidance Action Defense Costs [Member]	Jun. 30, 2012 Reserve for Avoidance Action Defense Costs [Member]	Mar. 31, 2012 Reserve for Avoidance Action Defense Costs [Member]	Jun. 30, 2013 Reserve for Avoidance Action Defense Costs [Member] Trust Professionals [Member]	Jun. 30, 2012 Reserve for Avoidance Action Defense Costs [Member] Trust Professionals [Member]	Jun. 30, 2013 Reserve for Residual Wind-Down Costs [Member]	Mar. 31, 2013 Reserve for Residual Wind-Down Costs [Member]	Jun. 30, 2012 Reserve for Residual Wind-Down Costs [Member]	Mar. 31, 2012 Reserve for Residual Wind-Down Costs [Member]	Jun. 30, 2013 Reserve for Residual Wind-Down Costs [Member] Trust Professionals [Member]	Jun. 30, 2012 Reserve for Residual Wind-Down Costs [Member] Trust Professionals [Member]	Jun. 30, 2012 Reserve for Residual Wind-Down Costs [Member] Other Administrative Expenses [Member]
Summary of activity in reserves for expected costs of liquidation
Beginning Balance	$ 61,513	$ 76,111							$ 38,043	$ 56,815							$ 20,442	$ 13,320							$ 491	$ 499	$ 651	$ 647			$ 760	$ 898	$ 1,240	$ 1,280			$ 1,394	$ 1,631	$ 3,240	$ 4,049
Plus additions to (reductions in) reserves	(1,678)	720							141	(3,241)							(1,819)	3,961
Less liquidation costs incurred:
Liquidation costs incurred			(4,664)	(8,869)	(1,430)	(1,592)	(140)	(66)			(3,604)	(6,491)	(973)	(1,129)	(13)	(20)			(685)	(1,539)	(449)	(467)	(127)	(36)					(8)	4					(138)	(40)					(237)	(799)	(10)
Ending Balance	$ 53,601	$ 66,304							$ 33,594	$ 45,934							$ 17,362	$ 15,239							$ 491	$ 499	$ 651	$ 647			$ 760	$ 898	$ 1,240	$ 1,280			$ 1,394	$ 1,631	$ 3,240	$ 4,049