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Acquisitions and Divestitures - Additional Information (Detail) - JPY (¥) ¥ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | ¥ 631,770 | ¥ 627,683 | ¥ 488,856 | ¥ 495,276
Bargain purchase gain |  | 0 | 1,174 | 0 |
Gain on sale of controlling interest |  | 37,930 |  |  |
Retained interest, fair value disclosure |  | ¥ 19,540 |  |  |
ORIX Credit |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Sale of stock, percentage of ownership before transaction |  | 66.00% |  |  |
Sale of stock, percentage of ownership after transaction |  | 34.00% |  |  |
Real Estate Segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | ¥ 16,168 | 16,168 | 16,168 | 16,359
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  |  | 137 |  |
Corporate Financial Services and Maintenance Leasing |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | 15,051 | 15,105 | 11,576 | 66,501
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  |  |  | 163,775 |
Corporate Financial Services and Maintenance Leasing | Yayoi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  |  |  | 163,016 |
ORIX USA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | 171,880 | 151,582 | 141,000 | 128,318
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | (1,978) | 10,201 | 20,041 |
Asia and Australia |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | 5,982 | 5,428 | 5,395 | 5,007
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  |  | 4,676 | 6,701 |
PE Investment and Concession |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | 19,822 | 2,367 |  |
ORIX Europe |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | 177,515 | 158,588 | 149,270 | 140,497
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | 2,502 |  |  |
Environmental And Energy |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | (5,557) | 16,698 | 1,447 |
Aircraft and Ships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  | 0 | 0 | 0 | ¥ 0
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  |  | (1,076) |  |
Banking and Credit Segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | 57,470 |  |  |
DHC Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions consideration, cost of acquired entity paid in cash |  | 300,000 |  |  |
Goodwill acquired |  | 94,324 |  |  |
Acquired intangible assets other than goodwill |  | 104,910 |  |  |
Business acquisition, effective date of Acquisition | Jan. 31, 2023 |  |  |  |
DHC Corporation | Selling, General and Administrative Expenses |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  |  | 3,435 | 3,435 |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions consideration, cost of acquired entity paid in cash |  | 11,894 | 60,876 | 99,239 |
Goodwill acquired |  | 4,241 | 17,644 | 49,393 |
Acquired intangible assets other than goodwill |  | 7,049 | 31,087 | 39,977 |
Divestiture |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net |  | ¥ 72,488 | ¥ 33,000 | ¥ 191,999 |

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