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Investment in Affiliates - Additional Information (Detail) (JPY ¥) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in affiliates, aggregate investment | ¥ 32,860 | ¥ 67,835 |
Investment in affiliates, market value | 38,918 | 99,758 |
Investment in affiliates, dividends received | 9,957 | 10,221 | 8,653
Investment in affiliates, excess of cost over the underlying equity at acquisition dates | 35,889 | 25,556 |
Asset management fee paid | 36,150 | 593 | 493
Gains on the sales office buildings | 5,872 | 5,816 | 2,222
Gains on life insurance premium and related investment income | 155,406 | 138,726 | 126,907
Percentage of ownership interest acquired |  | 51.00% |
Gain loss on sale of stock in subsidiary or equity method investee |  | 3,132 |
Gains on sales of subsidiaries and affiliates | 64,923 | 7,883 | 3,317
Monex Group |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Sales of stock by subsidiaries or affiliates, percentage of ownership before the transaction |  |  | 21.00%
Sales of stock by subsidiaries or affiliates, percentage of ownership after the transaction |  |  | 22.00%
Impairment losses recognized |  |  | 12,713
Investment in affiliates, percentage of ownership |  |  | 22.00%
ORIX JREIT Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Asset management fee paid | 1,905 | 1,743 | 1,691
Gains on the sales office buildings | 2,261 | 3,119 | 989
Gains on life insurance premium and related investment income |  |  | 1,995
DAIKYO |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of common stock shares acquired in business acquisition | 398,204,999 |  |
Investment in affiliates, percentage of ownership | 31.70% | 31.00% | 31.00%
Investment in affiliates, percentage of ownership | 64.10% |  |
Gains on sales of subsidiaries and affiliates | ¥ 58,435 |  |
ORIX Credit |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in affiliates, percentage of ownership |  |  | 49.00%

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