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Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in income of investees	$ 4,454	$ 4,934	$ 14,331	$ 10,096
Cash received on transfer of other investments			15,750	0
Secured financing	16,395		16,395		$ 0
Amortized cost	14,186		14,186
Net gain	838		1,269
Unrealized loss on secured borrowings, fair value adjustment	$ 838		1,973
Proceeds from sales of investments valued under the measurement alternative			6,419	22,531
Gain on sale of investment			$ 4,973	$ 11,133
Equity method investments in Partnerships
Schedule of Equity Method Investments [Line Items]
Percent interest in partnerships	1.00%		1.00%

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