Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Textual) [Abstract]
Increase (decrease) in estimates of reserves	$ 17,488	$ 52,994
Reserve for Expected Reporting Costs [Member]
Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Textual) [Abstract]
Increase (decrease) in estimates of reserves	12,293	20,560
Reserve for Expected Wind-Down Costs [Member]
Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Textual) [Abstract]
Increase (decrease) in estimates of reserves	$ 5,195	$ 32,434