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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.

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