v3.26.1
Pension Plans (Fair Value of Pension Plan Assets by Asset Category) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Japanese plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets ¥ 152,103 ¥ 137,712 ¥ 143,101
Japanese plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Japanese plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 57,512 41,472  
Japanese plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 0 0  
Japanese plans | Defined Benefit Plan, Equity Securities | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 19,029 [1] 15,268 [2]  
Japanese plans | 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]  
Japanese plans | 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]  
Japanese plans | 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]  
Japanese plans | Defined Benefit Plan, Equity Securities | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [3] 21,666 19,447  
Japanese 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 [3] 0 0  
Japanese 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 [3] 0 0  
Japanese 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 [3] 0 0  
Japanese plans | Defined Benefit Plan, Debt Security | Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 28,365 [4] 28,787 [5]  
Japanese plans | 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]  
Japanese plans | 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]  
Japanese plans | 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]  
Japanese plans | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [6] 25,531 32,738  
Japanese plans | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [6] 0 0  
Japanese plans | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [6] 0 0  
Japanese plans | Defined Benefit Plan, Debt Security | Other than Japan Pooled Funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [6] 0 0  
Japanese plans | Other Plan Asset | Life Insurance Company General Accounts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 27,989 29,136  
Japanese plans | Other Plan Asset | Life Insurance Company General Accounts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Japanese plans | Other Plan Asset | Life Insurance Company General Accounts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 27,989 29,136  
Japanese plans | Other Plan Asset | Life Insurance Company General Accounts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Japanese plans | Other Plan Asset | Other Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 29,523 12,336  
Japanese plans | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Japanese plans | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 29,523 12,336  
Japanese plans | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 173,068 151,819 ¥ 153,803
Overseas plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 162,020 139,804  
Overseas plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 10,336 11,293  
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 70,171 54,119  
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 70,171 54,119  
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 [3] 712 722  
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 [3] 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 [3] 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 [3] 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 91,849 85,685  
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 91,849 85,685  
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 4,403 4,094  
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 4,403 4,094  
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 [7] 444 455  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 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 [7] 444 455  
Overseas plans | Other Plan Asset | Life Insurance Company General Accounts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [7] 0 0  
Overseas plans | Other Plan Asset | Other Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 5,489 6,744  
Overseas plans | Other Plan Asset | Other Investment | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 0 0  
Overseas plans | Other Plan Asset | Other Investment | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] 5,489 6,744  
Overseas plans | Other Plan Asset | Other Investment | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets [8] ¥ 0 ¥ 0  
[1] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥42 million at March 31, 2026.
[2] These funds invest in listed shares including shares of ORIX Corporation in the amounts of ¥30 million at March 31, 2025.
[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 ¥6 million at March 31, 2026.
[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 ¥7 million at March 31, 2025.
[6] These funds invest approximately 100% in foreign government bonds.
[7] Life insurance company general accounts are accounts with guaranteed capital and minimum interest rate, in which life insurance companies manage funds on several contracts.
[8] Others include derivative instruments held for hedging change in the fair value of equity securities, and short-term instruments.