Commitments and Contingencies Information Regarding Other Commitments (Details 5) (USD $) In Thousands, unless otherwise specified					12 Months Ended				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013		Mar. 31, 2014 Investment In Limited Partnerships [Member]	Mar. 31, 2014 Fauchier [Member]	Mar. 13, 2013 Fauchier [Member]	Mar. 31, 2014 Fauchier [Member] Contingent Payment Due on Second Anniversary of Acquisition [Member]	Mar. 31, 2014 Fauchier [Member] Contingent Payment Due on Fourth Anniversary of Acquisition [Member]	Mar. 31, 2014 Fauchier [Member] Estimate of Fair Value Measurement [Member]	Mar. 13, 2013 Fauchier [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 QS Investors [Domain]	Mar. 31, 2014 QS Investors [Domain] Contingent Payment Due on Second Anniversary of Acquisition [Member]	Mar. 31, 2014 QS Investors [Domain] Contingent Payment Due on Fourth Anniversary of Acquisition [Member]
Other Commitments [Line Items]
Commitments in Limited Partnerships				$ 34,536
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High							25,000	33,000				10,000	20,000
Business Combination, Contingent Consideration, Liability	(29,553)	(21,900)	[1]			21,566			29,553	21,566
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability					7,653				2,653
Payments to Acquire Business, Gross, Expected											11,000
Business Combination, Contingent Consideration, Liability Fair Value Adjustment									$ 5,000

[1] See Note 2.