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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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