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ORIX Corporation Shareholders' Equity - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Stockholders Equity Note [Line Items]      
Dividends to be distributed to shareholders ¥ 30,117    
Declared date of dividends to be distributed to shareholders 2014-05    
Record date of dividends to be distributed to shareholders Mar. 31, 2014    
Amount available for dividends under the Japanese Companies Act 276,487    
Equity in undistributed earnings of the companies accounted for by the equity method 17,825 13,836 1,983
Restricted net assets of certain subsidiaries which include regulatory capital requirements for life insurance and banking operations 42,765    
Maximum
      
Stockholders Equity Note [Line Items]      
Restricted net assets of certain subsidiaries, percentage to consolidated net assets 25.00%    
Retained Earnings
      
Stockholders Equity Note [Line Items]      
Equity in undistributed earnings of the companies accounted for by the equity method ¥ 40,226