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Investment in Affiliates - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 ORIX JREIT Inc. USD ($) | Mar. 31, 2011 ORIX JREIT Inc. JPY (¥) | Mar. 31, 2010 ORIX JREIT Inc. JPY (¥) | Mar. 31, 2009 ORIX JREIT Inc. JPY (¥) | Mar. 31, 2010 DAIKYO JPY (¥) | Mar. 31, 2009 DAIKYO JPY (¥) | Mar. 31, 2011 DAIKYO | Mar. 31, 2010 Fuji Fire And Marine Insurance Company Limited JPY (¥) | Mar. 31, 2009 Fuji Fire And Marine Insurance Company Limited JPY (¥) | Mar. 31, 2010 Certain investment in affiliates JPY (¥) | Mar. 31, 2010 ORIX Credit JPY (¥) | Mar. 31, 2011 ORIX Credit | Mar. 31, 2010 ORIX Credit Change During Period, Fair Value Disclosure JPY (¥) | Mar. 31, 2011 Monex Group USD ($) | Mar. 31, 2011 Monex Group JPY (¥) | Mar. 31, 2010 Monex Group JPY (¥)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in affiliates, aggregate investment | $ 648 | ¥ 53,851 | ¥ 55,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in affiliates, market value | 652 | 54,237 | 69,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in affiliates, excess of cost over the underlying equity at acquisition dates | 387 | 32,187 | 24,856 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in affiliates, dividends received | 35 | 2,875 | 1,702 | 11,046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset management fee paid |  |  |  |  | 19 | 1,555 | 1,572 | 1,672 |  |  |  |  |  |  |  |  |  |  |  |
Gains on the sales office buildings | 61 | 5,103 | 6,841 | 24,346 | 47 | 3,905 | 3,564 | 23,895 |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |
Sales of stock by subsidiaries or affiliates, value of shares received in exchange |  |  |  |  |  |  |  |  | 26,617 | 9,439 |  |  |  |  |  |  |  |  |  |
Investment in affiliates, percentage of ownership |  |  |  |  |  |  |  |  | 31.00% | 41.00% | 31.00% |  | 20.00% |  | 49.00% | 49.00% |  | 21.00% | 21.00% | 22.00%
Gains (losses) on sales of stock by subsidiaries and affiliates |  |  | 2,724 |  |  |  |  |  |  | 3,576 |  |  |  |  | 3,571 |  | 3,430 |  |  | 9,337
Sales of stock by subsidiaries or affiliates, number of shares issued |  |  |  |  |  |  |  |  | 99,950,000 |  |  | 156,976,000 | 117,000,000 |  |  |  |  | 140,000 | 140,000 |
Sales of stock by subsidiaries or affiliates, price per share |  |  |  |  |  |  |  |  | ¥ 182 |  |  | ¥ 86 | ¥ 135 |  |  |  |  |  | ¥ 22,765 |
Sales of stock by subsidiaries or affiliates, value of shares issued |  |  |  |  |  |  |  |  | 18,216 |  |  | 13,500 | 15,795 |  |  |  |  | 38 | 3,187 |
Shares issued for acquisiton of Boom Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,685 | 65,685 |
Sales of stock by subsidiaries or affiliates, percentage of ownership before the transaction |  |  |  |  |  |  |  |  | 41.00% |  |  | 20.00% | 26.00% |  |  |  |  | 22.00% | 22.00% |
Sales of stock by subsidiaries or affiliates, percentage of ownership after the transaction |  |  |  |  |  |  |  |  | 31.00% |  |  | 15.00% | 20.00% |  |  |  |  | 21.00% | 21.00% |
Adjustment to the carrying amount of investments |  |  | 121,375 |  |  |  |  |  | 3,789 |  |  | 1,839 | 4,574 |  |  |  |  | 9 | 710 |
Other than temporary impairment losses related to certain affiliates whose shares were listed |  |  |  | 29,965 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on change in fair value of an investment that is measured at fair value by the election of fair value option under ASC 825-10 |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,954 |  |  |  |  |  |
Investment in affiliates | 3,747 | 311,556 | 293,488 |  |  |  |  |  | 25,828 |  |  |  |  |  | 123,590 |  |  |  |  |
Loans to affiliate | $ 743 | ¥ 61,820 | ¥ 116,223 |  |  |  |  |  | ¥ 95,547 |  |  |  |  |  | ¥ 96,680 |  |  |  |  |

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- Definition Long-Term advances receivable form a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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- Definition The item represents the difference, if any, between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee. A difference can arise between the carrying value of the equity method investment and the value of the Entity's amount of underlying equity in net assets of the investee, for example, from appreciation of certain assets which is not recognized in earnings, but is recognized in other comprehensive income (a separate component of shareholders' equity) by the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(3) + Details
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- Definition Gain or loss on entity's disposition of equity in securities of subsidiaries or 50 percent or less owned persons. Reflects the difference in the parent company's carrying amount of the equity interest in the subsidiary (or equity method investee) immediately before and after all stock transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph g -Article 9 + Details
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- Definition The value of the consideration received for selling an asset or business through a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 + Details
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- Definition Dollar value assigned to consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Include amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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