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Pension Plans (Fair Value of Pension Plan Assets by Asset Category) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Japan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets ¥ 137,712 ¥ 143,101 ¥ 136,803
Japan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Japan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 41,472 35,969  
Japan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 15,268 [1] 17,445 [2]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [1] 0 [2]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [1] 0 [2]  
Japan | Defined Benefit Plan, Equity Securities | Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [1] 0 [2]  
Japan | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [3] 19,447 25,645  
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 [3] 0 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 [3] 0 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 [3] 0 0  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 28,787 [4] 26,799 [5]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0 [5]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0 [5]  
Japan | Defined Benefit Plan, Debt Security | Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 [4] 0 [5]  
Japan | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 32,738 [6] 37,243 [7]  
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 0 [6] 0 [7]  
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 0 [6] 0 [7]  
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 0 [6] 0 [7]  
Japan | Other Plan Asset | Life Insurance Company General Accounts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 29,136 31,655  
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] 29,136 31,655  
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 [9] 12,336 4,314  
Japan | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] 0 0  
Japan | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] 12,336 4,314  
Japan | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] 0 0  
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 151,819 153,803 ¥ 122,204
Overseas plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 139,804 140,983  
Overseas plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 11,293 11,720  
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 54,119 61,210  
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 54,119 61,210  
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 722 [1] 1,100 [3]  
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 0 [1] 0 [3]  
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 0 [1] 0 [3]  
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 0 [1] 0 [3]  
Overseas plans | Defined Benefit Plan, Debt Security | Other than Japan Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 85,685 79,773  
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 85,685 79,773  
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 4,094 4,506  
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 4,094 4,506  
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] 455 471  
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] 455 471  
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 [9] 6,744 6,743  
Overseas plans | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] 0 0  
Overseas plans | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] 6,744 6,743  
Overseas plans | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [9] ¥ 0 ¥ 0  
[1] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥30 million at March 31, 2025.
[2] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥32 million at March 31, 2024.
[3] These funds invest in listed shares.
[4] 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 ¥7 million at March 31, 2025.
[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 ¥24 million at March 31, 2024.
[6] These funds invest approximately 100% in foreign government bonds.
[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.
[9] Others include derivative instruments held for hedging change in the fair value of equity securities, and short-term instruments.