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RELATED‑PARTY TRANSACTIONS (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	May 20, 2020	Aug. 01, 2019	May 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Treasury stock acquired, average cost per share (in dollars per share)				$ 64.18	$ 44.13	$ 46.71
Professional fees				$ 24,681	$ 21,704	$ 23,035
ORIX USA Corporation | Management Accounting Legal Regulatory And Other Administrative Services
Related Party Transaction [Line Items]
Related party fee revenue				2,875	828	$ 8,819
Unconsolidated entities | Management and administrative services
Related Party Transaction [Line Items]
Related party fee revenue				$ 126	$ 482
Class B shares
Related Party Transaction [Line Items]
Stock Repurchased and Retired During Period, Shares				286,730,000	654,994,000	36,958,000
Class A
Related Party Transaction [Line Items]
Shares issued and sold in Follow-on Offering (in shares)	3,000,000
Stock Repurchased and Retired During Period, Shares				1,591,995,000	671,187,000	1,481,114,000
Class A | ORIX USA Corporation
Related Party Transaction [Line Items]
Shares issued and sold in Follow-on Offering (in shares)		3,377,935	3,000,000
Selling price per share (in dollars per share)		$ 45.62	$ 45.80
Other Assets
Related Party Transaction [Line Items]
Loans receivable from employees				$ 16,657	$ 17,857

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