Basis of Presentation and Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]
Tax basis of securities held		$ 1,073,000,000	$ 1,123,000,000
Deferred tax Liabilities		0
Proceeds from liquidation of securities to fund avoidance action trust costs	$ 13,700,000		$ 13,715,000