Investments - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Fair value investments	$ 17,175	$ 21,586
Equity method investments in Partnerships
Schedule of Equity Method Investments [Line Items]
Equity method investments in Partnerships	363,531	340,603
Consolidated VIEs
Schedule of Equity Method Investments [Line Items]
Fair value investments	103,990	44,752
Total Investments of Consolidated VIEs	118,530	57,044
Consolidated VIEs | Equity method investments in Partnerships
Schedule of Equity Method Investments [Line Items]
Equity method investments in Partnerships	$ 14,540	$ 12,292