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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%