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v3.21.1

BACKGROUND (Details) |  |  |  |  | 12 Months Ended |  |  |  |
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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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