Variable Interest Entities and Consolidation of Investment Vehicles (Details 6) (CIVs, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Hedge funds
Nature of Investments
Fair Value Determined Using NAV	$ 24,792	[1]	$ 31,575	[2]
Percentage of Daily Redemption	11.00%		5.00%
Percentage of Monthly Redemption	8.00%		6.00%
Percentage of Quarterly Redemption	2.00%		5.00%
Percentage subject to lock-up or side pocket provisions (as a percent)	79.00%		84.00%
Investment lock up period or side pocket provisions period, low end of range (in years)	3		3
Investment lock up period or side pocket provisions period, high end of range (in years)	5		5
Private equity funds
Nature of Investments
Fair Value Determined Using NAV	26,982	[3]	25,071	[3]
Unfunded Commitments	5,549
Remaining term (in years)	6
Total
Nature of Investments
Fair Value Determined Using NAV	51,774		56,646
Unfunded Commitments	$ 5,549

[1] 11% daily redemption; 8% monthly redemption; 2% quarterly redemption; and 79% are subject to three to five year lock-up or side pocket provisions.

[2] 5% daily redemption; 6% monthly redemption; 5% quarterly redemption; and 84% are subject to three to five year lock-up or side pocket provisions.

[3] Liquidations are expected over the remaining term.