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Investments - Valuation Methodologies (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)
Investment [Line Items]
Other investments	$ 16,395	$ 15,913	$ 12,488
Private equity funds
Investment [Line Items]
Other investments	5,937	5,836	3,734
Direct credit co-investments
Investment [Line Items]
Other investments	3,129	3,093	3,940
Direct equity co-investments
Investment [Line Items]
Other investments	$ 7,329	$ 6,984	$ 4,814
Adjusted net asset value | Minimum | Private equity funds
Investment [Line Items]
Range of and weighted-average inputs	0.047
Adjusted net asset value | Maximum | Private equity funds
Investment [Line Items]
Range of and weighted-average inputs	0.047
Selected market return | Adjusted net asset value | Weighted Average | Private equity funds
Investment [Line Items]
Range of and weighted-average inputs	0.047
Market yield | Discounted cash flow | Minimum | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	0.097
Market yield | Discounted cash flow | Maximum | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	0.101
Market yield | Discounted cash flow | Weighted Average | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	0.0986
EBITDA multiple | Market approach | Minimum | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	8.0
EBITDA multiple | Market approach | Maximum | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	13.25
EBITDA multiple | Market approach | Weighted Average | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	10.87
Equity multiple | Market approach | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	1.25
Equity multiple | Market approach | Weighted Average | Direct credit co-investments
Investment [Line Items]
Range of and weighted-average inputs	1.25

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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