Fair Value Measurement - Valuation Methodologies (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 17,748	$ 19,820
Private equity funds
Schedule of Equity Method Investments [Line Items]
Fair Value	6,252
Direct credit investments
Schedule of Equity Method Investments [Line Items]
Fair Value	768
Direct equity investments
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 6,060
Selected market return | Adjusted net asset value | Minimum | Private equity funds
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	(0.006)
Selected market return | Adjusted net asset value | Maximum | Private equity funds
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	0.015
Selected market return | Adjusted net asset value | Weighted Average | Private equity funds
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	0.011
Market yield | Discounted cash flow | Minimum | Direct credit investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	0.138
Market yield | Discounted cash flow | Maximum | Direct credit investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	0.138
Market yield | Discounted cash flow | Weighted Average | Direct credit investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	0.138
EBITDA multiple | Market approach | Minimum | Direct equity investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	8.00
EBITDA multiple | Market approach | Maximum | Direct equity investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	13.75
EBITDA multiple | Market approach | Weighted Average | Direct equity investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	11.06
Equity multiple | Market approach | Weighted Average | Direct equity investments
Schedule of Equity Method Investments [Line Items]
Range of and weighted-average inputs	1.52