Significant Accounting Policies Consolidation (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015
Variable Interest Entity
Number of Collateralized Security Vehicles			3
Variable Interest Entity, Consolidated, Carrying Amount, Assets		$ 5,276
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		$ 4,362
Variable Interest Entity, Number of Collateralized Securites Vehicles			3
Variable Interest Entity, Primary Beneficiary, Number of Collateralized Securites Vehicles		0	0
Number of Sponsored Investment Fund Vie	11	5	1
Employee Owned Funds		1	14	17
Consolidated Investment Vehicles [Member]
Variable Interest Entity
Assets, Fair Value Disclosure		$ 58,725
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount		4,959
Proprietary Funds [Member] | Consolidated Investment Vehicles [Member]
Variable Interest Entity
Assets, Fair Value Disclosure		$ 28,300	$ 13,641