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Fair Value of Pension Plan Assets by Asset Category (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Overseas Pension Plans Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets ¥ 62,042 ¥ 3,825 ¥ 3,040
Overseas Pension Plans Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 57,360 0  
Overseas Pension Plans Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 4,682 3,825  
Overseas Pension Plans Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 0  
Domestic Pension Plans Of Foreign Entity Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 104,984 93,144 82,905
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 0  
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 104,984 93,144  
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 0  
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 59 [1] 57 [2]  
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [1] 0 [2]  
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 59 [1] 57 [2]  
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [1] 0 [2]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 14,981 [3] 12,458 [4]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 18,430 [2] 14,613 [2]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [3] 0 [4]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [2] 0 [2]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 14,981 [3] 12,458 [4]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 18,430 [2] 14,613 [2]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [3] 0 [4]  
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [2] 0 [2]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 28,931 [5] 26,208 [6]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 16,702 [7] 14,641 [8]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [5] 0 [6]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [7] 0 [8]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 28,931 [5] 26,208 [6]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 16,702 [7] 14,641 [8]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Japan
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [5] 0 [6]  
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [7] 0 [8]  
Municipal Bonds | Overseas Pension Plans Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 5,399 3,332  
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 1,779 0  
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 3,620 3,332  
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 0  
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   177 [9]  
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 161 [9]    
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   0 [9]  
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 1 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [9]    
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   177 [9]  
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 2 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 161 [9]    
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   0 [9]  
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 3 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [9]    
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 17,860 [9] 17,703 [9]  
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [9] 0 [9]  
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 17,860 [9] 17,703 [9]  
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [9] 0 [9]  
Other | Overseas Pension Plans Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   259 [10]  
Other | Overseas Pension Plans Defined Benefit | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 842 [10]    
Other | Overseas Pension Plans Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   0 [10]  
Other | Overseas Pension Plans Defined Benefit | Level 1 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [10]    
Other | Overseas Pension Plans Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   259 [10]  
Other | Overseas Pension Plans Defined Benefit | Level 2 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 842 [10]    
Other | Overseas Pension Plans Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets   0 [10]  
Other | Overseas Pension Plans Defined Benefit | Level 3 | Other Assets
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [10]    
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 8,080 [10] 7,521 [10]  
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [10] 0 [10]  
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 8,080 [10] 7,521 [10]  
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [10] 0 [10]  
Shares | Overseas Pension Plans Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 24,420 [1]    
Shares | Overseas Pension Plans Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 24,420 [1]    
Shares | Overseas Pension Plans Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [1]    
Shares | Overseas Pension Plans Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0 [1]    
Government Bonds | Overseas Pension Plans Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 15,317    
Government Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 15,317    
Government Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0    
Government Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0    
Corporate Bonds | Overseas Pension Plans Defined Benefit | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 15,844    
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 15,844    
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets 0    
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas
      
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]      
Fair value of pension plan assets ¥ 0    
[1] These shares and funds invest in listing shares.
[2] These funds invest in listing shares.
[3] These funds invest in listing shares include shares of ORIX Corporation in the amounts of ¥25 million and units of ORIX JREIT Inc. in the amounts of ¥181 million at March 31, 2014.
[4] These funds invest in listing shares include shares of ORIX Corporation in the amounts of ¥12 million and units of ORIX JREIT Inc. in the amounts of ¥179 million at March 31, 2013.
[5] These funds invest approximately 70% in Japanese government bonds, approximately 10% in Japanese municipal bonds, and approximately 20% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥46 million and investment corporation bonds of ORIX JREIT Inc. in the amounts of ¥20 million at March 31, 2014.
[6] These funds invest approximately 70% in Japanese government bonds, approximately 10% in Japanese municipal bonds, and approximately 20% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥107 million and investment corporation bonds of ORIX JREIT Inc. in the amounts of ¥41 million at March 31, 2013.
[7] These funds invest entirely in foreign government bonds.
[8] These funds invest approximately 90% in foreign government bonds and approximately 10% in foreign corporate bonds.
[9] Life insurance company general accounts are accounts with guaranteed capital and minimum interest rate, in which life insurance companies manage funds on several contracts.
[10] Others include derivative instruments held for hedging change in the fair value of equity securities, and short-term instruments.