Acquisitions Fauchier Acquisition - Fair Value Assumptions (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 13, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 26,375	$ 0		$ 26,375	$ 0
Business Combination, Contingent Consideration, Liability	90,464			90,464		$ 110,784	$ 29,553
Fauchier [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				(27,117)
Business Combination, Contingent Consideration, Liability	$ 0			0		$ 27,117	$ 29,553	$ 21,566
Asset Management Contracts | Fauchier [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			6 years
Asset Management Contracts | Fauchier [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term AUM Growth Rate			(35.00%)
Fair Value Inputs, Attrition Rate			11.00%
Fair Value Input, Projected Cash Flow Growth Rate, Average			6.00%
Fair Value Inputs, Discount Rate			16.00%
Contingent Consideration Liability | Fauchier [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate			2.00%
Minimum | Contingent Consideration Liability | Fauchier [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate			(16.00%)
Maximum | Contingent Consideration Liability | Fauchier [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate			3.00%
Weighted Average | Contingent Consideration Liability | Fauchier [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate			(5.00%)
Change in Input Assumptions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				(26,375)	$ 0
Change in Input Assumptions [Member] | Fauchier [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				$ (5,014)