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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.

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