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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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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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