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Pension Plans (Fair Value of Pension Plan Assets by Asset Category) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Japan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets ¥ 136,803 [1] ¥ 137,317 [1] ¥ 134,392
Japan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 0 0  
Japan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 40,356 34,034  
Japan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 0 0  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 13,607 [2] 16,002 [3]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [2] 0 [3]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [2] 0 [3]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [2] 0 [3]  
Japan | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 19,692 [4] 21,366  
Japan | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0  
Japan | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0  
Japan | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 24,972 [5] 27,845 [6]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [5] 0 [6]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [5] 0 [6]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [5] 0 [6]  
Japan | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 38,176 38,070  
Japan | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Japan | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Japan | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Japan | Other Plan Asset | Life Insurance Company General Accounts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 32,372 29,462  
Japan | Other Plan Asset | Life Insurance Company General Accounts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Japan | Other Plan Asset | Life Insurance Company General Accounts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 32,372 29,462  
Japan | Other Plan Asset | Life Insurance Company General Accounts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Japan | Other Plan Asset | Other Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 7,984 [1] 4,572  
Japan | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [1] 0  
Japan | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 7,984 [1] 4,572  
Japan | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [1] 0  
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 122,204 127,251 ¥ 119,858
Overseas plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 107,350 115,931  
Overseas plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 13,894 10,289  
Overseas plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Shares      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 49,040 59,932  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Shares | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 49,040 59,932  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Shares | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Shares | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [4] 960 1,031  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [4] 0 0  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [4] 0 0  
Overseas plans | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [4] 0 0  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 58,310 55,999  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Government Bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 58,310 55,999  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Government Bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Government Bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Municipal Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 4,111 4,411  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Municipal Bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Municipal Bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 4,111 4,411  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Municipal Bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 486 351  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 486 351  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Overseas plans | Other Plan Asset | Other Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 9,297 5,527  
Overseas plans | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 0 0  
Overseas plans | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] 9,297 5,527  
Overseas plans | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [1] ¥ 0 ¥ 0  
[1] Others include derivative instruments held for hedging change in the fair value of equity securities, and short-term instruments.
[2] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥22 million at March 31, 2023.
[3] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥22 million at March 31, 2022.
[4] These funds invest in listed shares.
[5] These funds invest approximately 70% in Japanese government bonds, and approximately 30% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥35 million at March 31, 2023.
[6] These funds invest approximately 70% in Japanese government bonds, and approximately 30% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥37 million at March 31, 2022.
[7] These funds invest approximately 90% in foreign government bonds and approximately 10% in foreign corporate bonds.
[8] Life insurance company general accounts are accounts with guaranteed capital and minimum interest rate, in which life insurance companies manage funds on several contracts.