Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of residual wind-down claims reserve
Balance, beginning of year	$ 32,247
Plus reserves received during the year from MLC		33,807
Less claims incurred/paid during the year	(1,392)	(1,560)
Balance, end of year	$ 30,855	$ 32,247