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Pension Plans (Fair Value of Pension Plan Assets by Asset Category) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | --- | ---
Japan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets |  | ¥ 143,101 |  | ¥ 136,803 |  | ¥ 137,317
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 |  | 35,969 |  | 40,356 |  |
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 |  | 17,445 | [1] | 13,607 | [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] | 25,645 |  | 19,692 |  |
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 |  | 26,799 | [4] | 24,972 | [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 |  | 37,243 | [6] | 38,176 |  |
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 |  |
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 |  |
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 |  |
Japan | Other Plan Asset | Life Insurance Company General Accounts |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets | [7] | 31,655 |  | 32,372 |  |
Japan | 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 |  |
Japan | Other Plan Asset | Life Insurance Company General Accounts | Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets | [7] | 31,655 |  | 32,372 |  |
Japan | 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 |  |
Japan | Other Plan Asset | Other Investment |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets | [8] | 4,314 |  | 7,984 |  |
Japan | Other Plan Asset | Other Investment | Level 1 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets | [8] | 0 |  | 0 |  |
Japan | Other Plan Asset | Other Investment | Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets | [8] | 4,314 |  | 7,984 |  |
Japan | 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 |  | 153,803 |  | 122,204 |  | ¥ 127,251
Overseas plans | Level 1 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets |  | 140,983 |  | 107,350 |  |
Overseas plans | Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of pension plan assets |  | 11,720 |  | 13,894 |  |
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 |  | 61,210 |  | 49,040 |  |
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 |  | 61,210 |  | 49,040 |  |
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] | 1,100 |  | 960 |  |
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 |  | 79,773 |  | 58,310 |  |
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 |  | 79,773 |  | 58,310 |  |
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 |  | 4,506 |  | 4,111 |  |
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 |  | 4,506 |  | 4,111 |  |
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] | 471 |  | 486 |  |
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] | 471 |  | 486 |  |
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] | 6,743 |  | 9,297 |  |
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] | 6,743 |  | 9,297 |  |
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 ¥32 million at March 31, 2024.
[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.
[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 ¥24 million at March 31, 2024.
[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 90% in foreign government bonds and approximately 10% in foreign corporate 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.

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