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Acquisition - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 11, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Cash paid for acquisition		$ 0	$ 0	$ 5,228
Common stock issued in acquisition		0	0	$ 612
Goodwill		$ 3,943	$ 3,943
Real Asset Portfolio Management LLC
Business Acquisition [Line Items]
Cash paid for acquisition	$ 5,840
Aggregate purchase price	5,228
Additional maximum amount payable to principals	8,499
Goodwill	$ 2,874
Real Asset Portfolio Management LLC | Common Class A
Business Acquisition [Line Items]
Common stock issued in acquisition (in shares)	27,240
Common stock issued in acquisition	$ 612
Customer Contracts | Real Asset Portfolio Management LLC
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 2,948
Finite-lived intangible asset useful life	8 years

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Number of shares of equity interests issued or issuable to acquire entity.

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