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ORIX Corporation Shareholders' Equity - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Common Stock | Mar. 31, 2010 Common Stock JPY (¥) | Mar. 31, 2009 Common Stock | Mar. 31, 2010 Additional Paid-in Capital JPY (¥) | Mar. 31, 2009 Additional Paid-in Capital JPY (¥) | Mar. 31, 2011 Retained Earnings USD ($) | Mar. 31, 2011 Retained Earnings JPY (¥) | Mar. 31, 2010 Retained Earnings JPY (¥) | Mar. 31, 2009 Retained Earnings JPY (¥) | Mar. 31, 2011 Maximum | Mar. 31, 2009 Flexible Capital Policy JPY (¥) | Mar. 31, 2009 Merger Of Consolidated Subsidiary JPY (¥)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to be distributed to shareholders | $ 103 | ¥ 8,599 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declared date of dividends to be distributed to shareholders | 2011-05 | 2011-05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date of dividends to be distributed to shareholders | Mar. 31, 2011 | Mar. 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve reclassified to retained earnings |  |  |  | 2,220 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  | 0 | 18,000,000 | 0 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | 83,024 |  |  | 41,677 |  | 41,347 |  |  |  |  |  |  |  |
Amount available for dividends under the Japanese Companies Act | 2,904 | 241,449 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted net assets of certain subsidiaries which include regulatory capital requirements for life insurance and banking operations | 567 | 47,121 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of the companies accounted for by the equity method | 202 | 16,806 | 8,364 | (40,458) |  |  |  |  |  | 334 | 27,812 |  |  |  |  |
Restricted net assets of certain subsidiaries, percentage to consolidated net assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Treasury stocks acquired | 1 | 70 | 3 | 29,294 |  |  |  |  |  |  |  |  |  |  | 29,290 |
Treasury stocks disposed |  |  | ¥ 291 | ¥ 1,595 |  |  |  |  | ¥ (533) |  |  | ¥ (531) | ¥ (9,915) |  |  | ¥ 12,013

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