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BACKGROUND (Details)					12 Months Ended
	May 20, 2020 shares	Aug. 01, 2019 $ / shares shares	May 30, 2019 $ / shares shares	Aug. 19, 2015 class_of_stock	Mar. 31, 2021 USD ($) segment $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2020	Mar. 31, 2018 shares	Nov. 30, 2015 USD ($)	Aug. 18, 2015 vote
Class of Stock [Line Items]
Number of business segments | segment					3
Number of classes of common stock | class_of_stock				2
Conversion ratio of common stock											1
Professional fees | $					$ 24,681,000	$ 21,704,000	$ 23,035,000
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares					$ 64.18	$ 44.13	$ 46.71
IPO
Class of Stock [Line Items]
Compensation expenses associated with the accrual of certain deferred cash payments granted | $					$ 0	$ 10,035,000	$ 10,273,000
IPO | Restricted Stock
Class of Stock [Line Items]
Compensation expenses associated with the amortization of awards granted | $					$ 0	$ 14,289,000	$ 14,045,000
Vesting period, restricted stock					4 years 6 months
Class A
Class of Stock [Line Items]
Common stock voting rights, number of votes per share | vote											1
Number of common shares outstanding (in shares)					51,245,442	46,178,633
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 B
Class of Stock [Line Items]
Common stock voting rights, number of votes per share | vote											10
Number of common shares outstanding (in shares)					16,951,696	19,345,277
Stock Repurchased and Retired During Period, Shares					286,730,000	654,994,000	36,958,000
Common Stock | Class A
Class of Stock [Line Items]
Number of common shares outstanding (in shares)					51,245,442	46,178,633	38,200,802		30,604,405
Shares issued and sold in Follow-on Offering (in shares)					8,751	9,145	6,570
Common Stock | Class B
Class of Stock [Line Items]
Number of common shares outstanding (in shares)					16,951,696	19,345,277	27,197,734		37,187,932
Stock Repurchased and Retired During Period, Shares							2,000,000
ORIX USA Corporation | Class A
Class of Stock [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) | $ / shares		$ 45.62	$ 45.80
HL Holders | Class B
Class of Stock [Line Items]
Number of common shares outstanding (in shares)					16,951,696,000	19,345,277,000
Director | Class A
Class of Stock [Line Items]
Shares issued and sold in Follow-on Offering (in shares)					8,751,000	9,145,000
Accounts Payable and Accrued Liabilities | IPO
Class of Stock [Line Items]
Vesting period, restricted stock					4 years 6 months
ITALY | Leonardo
Class of Stock [Line Items]
Notes payable issued, dividend distribution | $										$ 14,000,000
Interest acquired in the investment banking operations of Leonardo in Italy (as a percent)					51.00%			51.00%		49.00%

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