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Investments - Valuation Methodologies (Details) $ in Thousands | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other investments | $ 13,394 | $ 12,488 | $ 0
Private equity funds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other investments | 5,786 | 3,734 | 0
Direct credit co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other investments | 1,756 | 3,940 | 0
Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other investments | $ 5,852 | $ 4,814 | $ 0
Selected market return | Adjusted net asset value | Minimum | Private equity funds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | (0.074) |  |
Selected market return | Adjusted net asset value | Maximum | Private equity funds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | (0.03) |  |
Selected market return | Adjusted net asset value | Weighted Average | Private equity funds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | (0.062) |  |
Market yield | Discounted cash flow | Minimum | Direct credit co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 0.115 |  |
Market yield | Discounted cash flow | Maximum | Direct credit co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 0.126 |  |
Market yield | Discounted cash flow | Weighted Average | Direct credit co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 0.125 |  |
EBITDA multiple | Market approach | Minimum | Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 7.25 |  |
EBITDA multiple | Market approach | Maximum | Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 12 |  |
EBITDA multiple | Market approach | Weighted Average | Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 9.93 |  |
Equity multiple | Market approach | Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 1.05 |  |
Equity multiple | Market approach | Weighted Average | Direct equity co-investments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Range of and weighted-average inputs | 1.05 |  |

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