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Investments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Jan. 31, 2020	Jul. 01, 2019	Aug. 11, 2018	Aug. 02, 2018
Schedule of Equity Method Investments [Line Items]
Equity in income of investees	$ 20,250	$ 7,202	$ 17,102
Cash received on transfer of other investments	15,750	0	0
Secured financing	13,394	0
Amortized cost	12,894
Unrealized loss on investments	748
Unrealized gain on investments		705
Recognized gain on secured financing liability	43
Fair value adjustment				$ 1,507
Equity securities without readily determinable fair value, amount	17,091	6,764	2,990
Proceeds from sales of investments valued under the measurement alternative	6,419	22,531	$ 0
Impairment of equity securities		701
Manual Data Entry Software
Schedule of Equity Method Investments [Line Items]
Equity securities without readily determinable fair value, amount	2,000
Alternative Asset Investment Platform
Schedule of Equity Method Investments [Line Items]
Equity securities without readily determinable fair value, amount	10,000
Equity Securities sold July 1, 2019
Schedule of Equity Method Investments [Line Items]
Equity securities without readily determinable fair value, amount					$ 1,446
Proceeds from sales of investments valued under the measurement alternative	6,419
Gain on sale of investment	4,973
Equity securities sold August, 2 2018
Schedule of Equity Method Investments [Line Items]
Equity securities without readily determinable fair value, amount							$ 10,798
Proceeds from sales of investments valued under the measurement alternative	17,724
Gain on sale of investment	$ 6,926
Equity securities sold August 11, 2018
Schedule of Equity Method Investments [Line Items]
Equity securities without readily determinable fair value, amount						$ 600
Proceeds from sales of investments valued under the measurement alternative		4,807
Gain on sale of investment		$ 4,207
Partnerships
Schedule of Equity Method Investments [Line Items]
Percent interest in partnerships	1.00%

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