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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 68,138	$ 65,996	$ 197,116	$ 185,191
Management and advisory fees
Disaggregation of Revenue [Line Items]
Revenues	59,837	55,617	179,584	159,844
Specialized funds
Disaggregation of Revenue [Line Items]
Revenues	27,789	23,413	81,733	67,164
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues	22,618	21,594	67,047	63,087
Advisory
Disaggregation of Revenue [Line Items]
Revenues	5,878	5,926	18,091	18,287
Reporting and other
Disaggregation of Revenue [Line Items]
Revenues	2,237	2,260	6,492	6,373
Distribution management
Disaggregation of Revenue [Line Items]
Revenues	1,108	1,975	3,169	3,773
Fund reimbursement revenue
Disaggregation of Revenue [Line Items]
Revenues	207	449	3,052	1,160
Incentive fees
Disaggregation of Revenue [Line Items]
Revenues	8,301	10,379	17,532	25,347
Specialized funds
Disaggregation of Revenue [Line Items]
Revenues	3,638	10,227	11,257	18,036
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues	$ 4,663	$ 152	$ 6,275	$ 7,311

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- Definition

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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